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![College Geometry Online, eLearning](../machu_picchu_h1_910.jpg)
Online Math: Geometry: Parallel Lines, Theorems and Problems
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Parallel Lines, Page 1
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![Parallel Lines Index](parallel_lines_index_17.jpg) |
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![Parallelograms Index](parallelograms_17.jpg) |
Parallelogram. Theorems and Problems.
It
is a quadrilateral whose opposite
sides are parallel. |
![Rectangle Index](rectangle_index_17.jpg) |
Rectangle. Theorems and Problems Index. |
![Rhombus, Rhombuses, Rhombi](rhombus_index_17.jpg) |
Rhombus.
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![Wordflex Point](../ipad/wordflex/wordflex-ipad-parallel-semantic-syntactic-tree-geometry-1.jpg) |
Meanings and syntactic of 'PARALLEL'.
Created using Wordflex Touch Dictionary for iPad in association with Oxford University Press. |
![Geometry in the Real World: Griffith Observatory and Parallel Lines](real-world/los-angeles/geometric-art-parallel-lines-griffith-observatory-ipad-apps-1.jpg) |
Geometry in the Real World: Griffith Observatory,
L.A. and Parallel Lines. |
![Isolines: Celtic Maze](../software/isoline/geometric-art-celtic-maze-isoline-tablet-software-ipad-1.jpg) |
Geometric Art: Isolines, Celtic Maze, Spiral Pattern, Geometry for Kids, Software, iPad, Parallel Lines |
![Geometry Problem 1561](../school-college/6/p1561-highschool-college-geometry-triangle-ABC-circumcenter-orthocenter-angle-parallel-problem-1.jpg) |
Geometry Problem 1561:
Triangle ABC, Circumcenter O, Orthocenter H, Parallel Line, and Angle
Secrets. |
![Geometry Problem 1560](../school-college/6/p1560-trapezoid-ABCD-geometry-puzzle-angles-G-and-H-AGD-50-degrees-1.jpg) |
Geometry Problem 1560:
Trapezoid ABCD: Unlocking Angle Secrets at G and H. |
![Geometry Problem 1555](../school-college/6/p1555-circle-chord-intersect-geometry-problem-solving-1.jpg) |
Geometry Problem 1555: Find Length of DE. The problem involves chords, tangent, circles, and intersections of line |
![Geometry Problem 1552](../school-college/6/p1552-triangle-ABC-auxiliary-line-angle-calculation-1.jpg) |
Geometry Problem 1552: Exploring Angle C in Triangle ABC with Given Angle A and Side Lengths |
![Geometry Problem 1526](../school-college/6/p1526-parallelogram-intersecting-bisectors-distance-congruence-1.jpg) |
Geometry
Problem 1526: Mastering Geometry Problem-Solving: Discover the Distance Between Two Sides in a Parallelogram Using Bisectors and Distance Measures.
. |
![Geometry Problem 1525](../school-college/6/p1525-right-triangle-equilateral-midpoint-hypotenuse-distance-1.jpg) |
Geometry
Problem 1525 and a Thematic Poem.
Unveiling the Secrets of an Equilateral Triangle in Right Triangle Geometry: Finding the Midpoint Distance between Segments. |
![Geometry Problem 1524](../school-college/6/p1524-parallelogram-angle-bisector-intersect-distance-1.jpg) |
Geometry
Problem 1524 and a Thematic Poem.
Unlock the Mystery of Parallelograms: Discover the Length of Segment between the Intersecting Angle Bisectors. |
![Geometry Problem 1523](../school-college/6/p1523-calculate-length-altitude-isosceles-triangle-midpoint-1.jpg) |
Geometry
Problem 1523 and a Thematic Poem.
Discover How to Calculate the Length of the Altitude in an Isosceles Triangle - Get Expert Geometry Tips Now!
. |
![Geometry Problem 1522](../school-college/6/p1522-triangle-median-double-angle-side-geometry-poem-1.jpg) |
Geometry
Problem 1522 and a Thematic Poem.
Unlocking the Angle Measure of a Triangle with Median and Doubled Side Lengths. |
![Geometry Problem 1519](../school-college/6/p1519-parallelogram-length-midpoints-parallel-line-1.jpg) |
Geometry
Problem 1519 and a Thematic Poem.
Discover the Length of a Segment in a Parallelogram using Midpoints and Parallel Lines. |
![Geometry Problem 1517](../school-college/6/p1517-unlock-triangle-side-length-solving-median-angles-1.jpg) |
Geometry
Problem 1517 and a Thematic Poem.
Unlocking Triangle Side Length: Solving with a Median and Two Angles. Difficulty Level: High School. |
![Geometry Problem 1516](../school-college/6/p1516-solving-for-the-length-of-a-side-in-an-equiangular-hexagon-1.jpg) |
Geometry
Problem 1516 and a Thematic Poem.
Finding the Length of a Side in an Equiangular Hexagon with Given Three Side Lengths. Difficulty Level: High School. |
![Geometry Problem 1515](../school-college/6/p1515-distance-centroid-triangle-median-exterior-line-perpendicular-1.jpg) |
Geometry
Problem 1515 and a Thematic Poem.
Mastering Triangle Distance Calculation: Find the Distance from the Intersection of Medians to an Exterior Line. Difficulty Level: High School. |
![Geometry Problem 1506](../school-college/6/1506-two-parallel-lines-angles-corresponding-alternate-1.jpg) |
Geometry
Problem 1506.
Parallel Rays, Angles, Corresponding, Alternate. |
![Geometry Problem 1505](../school-college/6/p1505-three-parallel-rays-angles-corresponding-alternate-consecutive-bisector-1.jpg) |
Geometry
Problem 1505.
Parallel Rays, Angles, and Bisector, Corresponding, Alternate, Conjugate. |
![Geometry Problem 1504](../school-college/6/p1504-3-squares-equilateral-triangle-angle-parallel-1.jpg) |
Geometry
Problem 1504.
Squares, Equilateral Triangle, Parallel, Angle. |
![Geometry Problem 1502](../school-college/6/p1502-rigth-triangle-incircles-measurement-inradius-square-quadrilateral-1.jpg) |
Geometry
Problem 1502.
Right Triangle, Incircle, Inradius, Geometric Mean of 2 Inradii, Angle Bisector, Perpendicular, Tangential Quadrilateral. |
![Geometry Problem 1501](../school-college/6/p1501-square-interior-point-distance-equal-angles-measurement-1.jpg) |
Geometry
Problem 1501.
Square, Exterior Point, Congruent Angles, Segment, Measurement. |
![Geometry Problem 1500](../school-college/5/p1500-circle-tangent-secant-perpendicular-parallel-similarity-cyclic-quadrilateral-1.jpg) |
Geometry
Problem 1500.
Circle, Perpendicular, Tangent, Secant, Cyclic Quadrilateral, Parallel, Similarity, Measurement. |
![Geometry Problem 1495](../school-college/5/p1495-circle-parallel-chords-30-degree-square-radius-1.jpg) |
Geometry
Problem 1495.
Circle, Parallel Chords, 30 Degree Angle, Radius Squared. |
![Geometry Problem 1494](../school-college/5/p1494-parallelogram-midpoints-octagon-area-1.jpg) |
Geometry
Problem 1494.
Parallelogram, Midpoints, Octagon, Areas. |
![Geometry Problem 1493](../school-college/5/p1493-four-squares-vertex-parallelogram-auxliliary-line-1.jpg) |
Geometry
Problem 1493.
Four Squares, Parallelogram, Auxiliary Lines. |
![Dynamic Geometry 1479](../school-college/5/p1479-triangle-circumcircle-angle-perpendicular-bisector-parallel-concyclic-geogebra-ipad-1.jpg) |
Dynamic Geometry 1479.
Triangle, Circumcircle, Angle Bisector,
Perpendicular Bisector, Chord, Concyclic Points, Parallel Lines,, Step-by-step Illustration. GeoGebra,
iPad. |
![Dynamic Geometry 1470](../school-college/5/p1470-tangential-quadrilateral-circle-rhombus-geogebra-1.jpg) |
Dynamic Geometry 1470.
Tangential Quadrilateral, Incircles, Tangent,
Parallel, Rhombus, Step-by-step Illustration. |
![Geometry Problem 1456](../school-college/5/p1456-orthocenter-triangle-similarity-circles-geogebra-ipad-1.jpg) |
Geometry
Problem 1456.
Altitudes, Orthic Triangle, Circumcircle, Parallel lines, Similarity, Area,
iPad. Step-by-step illustration using GeoGebra. |
![Problem 1441](../school-college/5/p1441-intersecting-circles-perpendicular-bisector-parallel-1.jpg) |
Geometry Problem 1441.
Intersecting Circles, Perpendicular Bisector,
Parallel Lines, Art, Poster, Typography, iPad Apps. |
![Problem 1438](../school-college/5/p1438-triangle-incenter-circuncenter-centroid-parallel-90-degree-ipad-apps-1.jpg) |
Geometry Problem 1438.
Triangle, Incenter, Centroid, Circumcenter, Parallel, 90 Degree, Art, Poster, Typography, iPad Apps. |
![Problem 1435](../school-college/5/p1435-circle-diameter-tangent-parallelogram-1.jpg) |
Geometry Problem 1435.
Circle, Diameter, Inscribed Circles, Circular Sector, Parallelogram, Parallel Lines, Tangency Points,
Poster, Typography, iPad Apps. |
![Problem 1431](../school-college/5/p1431-apollonius-llc-triangle-circumcircle-tangent-congruent-angle-1.jpg) |
Geometry Problem 1431.
Triangle, Circumcircle, Parallel Chord, Apollonius, LLC, Congruent Angles, Poster, Conformal Mapping. |
![Problem 1418](../school-college/5/p1418-triangle-incenter-parallel-angle-circle-tangent-1.jpg) |
Geometry Problem 1418. Triangle, Circumcircle, Incenter, Side, Sum of Segments, Tangent, Parallel, Angle. |
![Problem 1402](../school-college/5/p1402-triangle-three-tangent-circles-diameter-collinearity-tutor-1.jpg) |
Geometry Problem 1402. Triangle, Three Tangent Circles, Parallel Diameter, Collinear Points. |
![Problem 1376 Isosceles Triangle, Circle](../school-college/4/p1376-isosceles-triangle-interior-cevian-exradius-parallel-1.jpg) |
Geometry Problem 1376. Isosceles Triangle, Interior Cevian, Excircles, Tangency Points, Parallel Lines. |
![Problem 1374 Isosceles Triangle, Circle](../school-college/4/p1374-isosceles-triangle-exterior-cevian-incircle-excircle-parallel-1.jpg) |
Geometry Problem 1374. Isosceles Triangle, Exterior Cevian, Incircle, Excircle, Tangency Points, Parallel Lines. |
![Geometry problem 1354](../school-college/4/p1354-circle-tangent-secante-parallel-tutoring-1.jpg) |
Geometry Problem 1354. Circle, Tangent Lines, Secant, Chord, Center, Parallel Lines. |
![Geometry problem 1342](../school-college/4/p1342-circle-chord-secant-parallel-midpoint-cyclic-1.jpg) |
Problem 1342.
Circle, Secant, Chord, Midpoint, Concyclic Points, Cyclic Quadrilateral.
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![Geometry problem 1329](../school-college/4/p1329-two-squares-90-degree-parallel-congruence-1.jpg) |
Geometry Problem 1329.
Two Squares Side by Side, Parallel, Perpendicular, 90 Degrees, Congruence. |
![Geometry problem 1307](../school-college/4/p1307-triangle-incenter-parallel-measurement-1.jpg) |
Geometry Problem 1307.
Triangle, Incenter, Parallel line, Sides, Measurement. |
![Geometry problem 1290](../school-college/3/p1290-triangle-median-angle-bisector-parallel-1.jpg) |
Geometry Problem 1290.
Triangle, Internal Angle Bisector, Median, Parallel, Measurement, Metric Relations. |
![Geometry problem 1268](../school-college/3/p1268-triangle-circle-angle-bisector-concyclic-1.jpg) |
Geometry Problem 1268.
Triangle, Exterior Angle Bisector, Circumcircle, Circle, Chord, Parallel, Concyclic Points, Cyclic Quadrilateral. |
![Geometry problem 1259](../school-college/3/p1259-triangle-circle-diameter-parallel-1.jpg) |
Geometry Problem 1259.
Triangle, Circumcircle, Circle, Diameter, Parallel Lines. |
![Geometry problem 1249](../school-college/3/p1249-cyclic-quadrilateral-bisector-triangle-area-1.jpg) |
Geometry Problem 1249.
Cyclic Quadrilateral, Circle, Triangle, Circumcircle, Angle Bisector, Parallel Lines, Area. |
![Geometry problem 1248](../school-college/3/p1248-triangle-circle-orthocenter-diameter-parallel-1.jpg) |
Geometry Problem 1248.
Triangle, Circumcircle, Circle, Diameter, Orthocenter, Altitude, Parallel Lines. |
![Geometry problem 1237](../school-college/3/p1237-imo-2016-problem-1-triangle-parallel-concurrent-1.jpg) |
Geometry Problem 1237
IMO 2016, Problem 1, Triangle, Congruence, Parallel Lines, Midpoint, Concurrency. |
![Geometry problem 1224](../school-college/3/p1224-triangle-6-parallel-side-class-1.jpg) |
Geometry Problem 1224
Triangle, Parallel to the Sides. |
![Geometry problem 1223](../school-college/3/p1223-circle-6-parallel-chords-tutor-1.jpg) |
Geometry Problem 1223
Circle, Parallel Chords. |
![Geometry problem 1221](../school-college/3/p1221-intersecting-circles-parallel-chord-tangent-collinear-1.jpg) |
Geometry Problem 1221
Intersecting Circles, Chord, Tangent, Parallel Chords, Collinear Points. |
![Geometry problem 1192](../school-college/2/p1192-trapezoid-triangle-midpoint-area-1.jpg) |
Geometry Problem 1192
Trapezoid, Triangle, Diagonal, Midpoint, Area, Parallel. |
![Geometry problem 1188](../school-college/2/p1188-triangle-parallelogram-area-trapezoid-congruence-parallel-1.jpg) |
Geometry Problem 1188
Triangle, Parallelogram, Parallel Lines, Trapezoid, Area. |
![Geometry problem 1183](../school-college/2/p1183-parallelogram-circle-diagonal-tangent-1.jpg) |
Geometry Problem 1183
Parallelogram, Diagonals, Circle, Tangent Line. |
![Geometry problem 1162](../school-college/2/p1162-triangle-circle-congruence-double-angle-circumcenter-1.jpg) |
Geometry Problem 1162.
Triangle, Congruence, Double Angle, Parallel Lines, Circle, Circumcenter. |
![Geometry problem 1139](../school-college/2/p1139-triangle-circumcircle-bisector-parallel-90-degrees-concurrent-1.jpg) |
Geometry Problem 1139.
Triangle, Circumcircle, Angle Bisector, Parallel Lines, 90 Degrees, Concurrent Lines. |
![Isolines: Celtic Maze](../software/isoline/geometric-art-celtic-triquetra-isoline-tablet-software-ipad-1.jpg) |
Geometric Art: Isolines, Triquetra, Celtic Knotwork, Trefoil Knot, Parallel Lines, Geometry for Kids, Software, iPad, Parallel Lines |
![Geometry problem 1135](../school-college/2/p1135-intersecting-circles-secant-90-degrees-perpendicular-similar-1.jpg) |
Geometry Problem 1135.
Intersecting Circles, Secant, Parallel Line, 90 Degrees, Similar Triangles. |
![Isolines: the Valknut](../software/isoline/geometric-art-valknut-isolines-three-triangle-tablet-software-ipad-1.jpg) |
Geometric Art: Isolines, the Valknut,
three Interlocked Triangles, Geometry for Kids, Software, iPad, Parallel Lines |
![Geometry problem 1132](../school-college/2/p1132-triangle-excircle-parallel-midpoint-tangent-1.jpg) |
Geometry Problem 1132.
Triangle, Excircle, Tangency Point, Parallel, Midpoint. |
![Isolines of Borromean Rings](../circle/geometric-art-borromean-rings-isolines-three-circle-tablet-software-ipad-1.jpg) |
Geometric Art: Isolines of Borromean Rings, Three Circles, Parallel Lines, Geometry for Kids, Software, iPad |
![Geometry problem 1129](../school-college/2/p1129-isosceles-triangle-incenter-circumcenter-parallel-perpendicular-1.jpg) |
Geometry Problem 1129.
Isosceles Triangle, Circumcenter, Incenter, Parallel Lines, Perpendicular Lines. |
![Isolines: Adinkra Symbol Ananse](../software/isoline/adinkra-ananse-isolines-wisdom-creativity-tablet-software-ipad-1.jpg) |
Geometric Art: Isolines, Adinkra Symbol, Ananse Ntontan, Wisdom, Software, iPad, Parallel Lines |
![Geometry problem 1128](../school-college/2/p1128-right-triangle-median-parallel-angle-hypotenuse-1.jpg) |
Geometry Problem 1128.
Right Triangles, Medians, Parallel, Angles, Congruence, Half the measure. |
![Geometry Problem 1117](../school-college/2/p1117-right-triangle-angle-trisector-parallel-math-1.jpg) |
Geometry Problem
1117.
Right Triangle, Angle Trisection, 90 Degrees, Parallel Lines. |
![Geometry Problem 1101](../school-college/2/p1101-triangle-circles-parallel-radius-incircle-math-1.jpg) |
Geometry Problem
1101.
Triangle, Parallel Lines, Circle, Incircle, Inradius, Radius, Angle. |
![Geometry Problem 1087](../school-college/1/p1087-tangent-circle-angle-15-degrees-tutoring-math-1.jpg) |
Geometry Problem
1087.
Tangent Circles, Parallel, 15 Degrees, Angle. |
![Geometry Problem 1084](../school-college/1/p1084-circle-chord-parallel-45-degrees-radius-metric-relations-triangle-class-math-1.jpg) |
Geometry Problem
1084.
Circle, Chord, Radius, Diameter, Parallel lines, 45 Degrees, Metric Relations. |
![Geometry Problem 1071](../school-college/1/p1071-arbelo-circle-semicircle-perpendicular-tangent-midpoint-problem-solving-tutor-1.jpg) |
Geometry Problem
1071.
Arbelos, Semicircles, Diameter, Circle, Perpendicular, Common Tangent, Parallel, Collinear Points, 90 Degrees,
Midpoint. |
![Geometry Problem 1047](../school-college/1/p1047-parallelogram-parallel-diagonal-concurrency-math-1.jpg) |
Geometry Problem
1047.
Parallelogram, Parallel Lines, Concurrent Lines, Diagonals. |
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Email | by Antonio Gutierrez
Last updated:
Feb 18, 2024
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