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Online Geometry: Parallel Lines, Theorems and Problems
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Parallel Lines, Page 3
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![Parallel Lines Index](parallel_lines_index_17.jpg) |
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![Geometry Problem 1039](../school-college/1/p1039-isosceles-triangle-circle-tangent-parallel-online-math-1.jpg) |
Geometry Problem
1039.
Isosceles Triangle, Circle, Tangent Line, Parallel Line. |
![Geometry Problem 1031](../school-college/1/p1031-intersecting-circle-trapezoid-tangent-common-chord-midpoint-math-1.jpg) |
Geometry Problem
1031.
Trapezoid, Intersecting Circles, Common Chord, Tangent Line, Midpoint, Parallel Lines. |
![Geometry Problem 1030](../school-college/1/p1030-quadrilateral-triangle-area-midpoint-parallel-online-math-1.jpg) |
Geometry Problem
1030.
Quadrilateral, Triangle, Area, Midpoint, Parallel lines. |
![Geometry Problem 1011](../school-college/1/p1011-triangle-angle-bisector-circle-parallel-math-1.jpg) |
Geometry Problem
1011.
Triangle, Angle Bisector, Vertex, Circle, Center, Radius, Parallel Lines. |
![Geometry Problem 1002](../school-college/1/p1002-triangle-circumcircle-parallel-concyclic-cyclic-quadrilateral-math-1.jpg) |
Geometry Problem
1002.
Triangle, Circumcircle, Cevian, Parallel Lines, Cyclic Quadrilateral, Concyclic Points. |
![Geometry Problem 997](../school-college/p997-equilateral-triangle-inscribed-three-parallel-metric-relations-1.jpg) |
Geometry Problem 997.
Equilateral Triangle, Vertices, Three Parallel Lines, Distance, Metric Relations. |
![Geometry Problem 995](../school-college/p995-quadrilateral-perpendicular-diagonal-bisector-parallel-1.jpg) |
Geometry Problem 995.
Quadrilateral, Perpendicular Diagonals, Perpendicular Bisector, Parallel. |
![Geometry Problem 994](../school-college/p994-trapezoid-midpoint-bases-concurrent-lines-1.jpg) |
Geometry Problem 994.
Trapezoid, Midpoints of the bases, Concurrent Lines. |
![Geometry Problem 990](../school-college/p990-triangle-incircle-median-circle-central-angle-congruence-1.jpg) |
Geometry Problem 990.
Triangle, Incircle, Median, Cevian, Central Angle, Congruence, Circle, Secant, Midpoint,
Parallel. |
![Geometry Problem 987](../school-college/p987-triangle-circumcircle-incenter-parallel-circle-tangent-animation-ipad-1.jpg) |
Geometry Problem 987.
Triangle, Circumcircle, Incenter, Chord, Parallel, Circle, Tangent. GeoGebra, HTML5 Animation for Tablets (iPad, Nexus). |
![Geometry Problem 980](../school-college/p980-equilateral-triangle-three-parallel-vertices-construction-1.jpg) |
Geometry Problem 980.
Equilateral Triangle, Vertices, Three Parallel, Equal Circles, Construction. |
![Geometry Problem 973](../school-college/p973-square-three-parallel-vertices-metric-relations-1.jpg) |
Geometry Problem 973.
Three Parallel, Square, Vertices, Distance Between Two Parallel Lines, Side, Metric Relations. |
![Geometry Problem 972](../school-college/p972-equilateral-triangle-three-parallel-vertices-1.jpg) |
Geometry Problem 972.
Equilateral Triangle, Vertices, Three Parallel, Equal Circles, Perpendicular Bisector. |
![Geometry Problem 951](../school-college/p951-intersecting-circles-tangent-diameter-parallel-cyclic-quadrilateral-1.jpg) |
Geometry Problem 951.
Intersecting Circles, Chord, Diameter, Parallel, Cyclic Quadrilateral, Concyclic Points. |
![Geometry Problem 947](../school-college/p947-triangle-circumcircle-angle-bisector-chord-parallel-1.jpg) |
Geometry Problem 947.
Triangle, Circumcircle, Angle Bisector, Chord, Arc, Parallel. |
![Geometry Problem 946](../school-college/p946-quadrilateral-diagonal-midpoint-parallel-area-1.jpg) |
Geometry Problem 946.
Triangle, Quadrilateral, Area, Diagonal, Midpoint, Parallel. |
![Geometry Problem 944](../school-college/p944-triangle-orthocenter-altitude-perpendicular-parallel-1.jpg) |
Geometry Problem 944.
Triangle, Orthocenter, Altitude, Perpendicular, 90 Degrees, Parallel Lines. |
![Geometry Problem 943](../school-college/p943-triangle-incircle-parallel-tangency-point-1.jpg) |
Geometry Problem 943.
Triangle, Incircle, Inscribed Circle, Tangency Points, Parallel, Metric Relations. |
![Problem 940](../school-college/p940-circle-tangent-secan-parallel-90-degrees-midpoint-1.jpg) |
Geometry Problem 940.
Circle, Tangent, Secant, Chord, Parallel, Perpendicular, 90 Degrees, Midpoint. |
![Problem 939](../school-college/p939-circle-tangent-parallel-secant-midpoint-1.jpg) |
Geometry Problem 939.
Circle, Tangent, Secant, Chord, Parallel, Midpoint. |
![Problem 925](../school-college/p925-cyclic-quadrilateral-diagonal-angle-bisector-parallel-1.jpg) |
Geometry Problem 925.
Cyclic Quadrilateral, Diagonal, Circle, Angle Bisector, Parallel.
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![Problem 919](../school-college/p919-rhombus-perpendicular-parallel-congruence-1.jpg) |
Geometry Problem 919.
Rhombus, Triangle, Perpendicular, 90 Degrees, Congruence.
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![Problem 914](../school-college/p914-triangle-orthocenter-angle-bisector-parallel-midpoint-1.jpg) |
Geometry Problem 914.
Triangle, Orthocenter, Angle Bisector, Parallel Lines, Midpoint.
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![Geometry Problem 895](../school-college/p895-triangle-incircle-tangent-parallel-collinear-html5-ipad-1.jpg) |
Geometry Problem 895
Triangle, Incircle, Tangency Points, Parallel line, Collinear Points.
GeoGebra, HTML5 Animation for Tablets |
![Geometry Problem 894](../school-college/p894-triangle-incenter-60-degrees-midpoint-parallel-html5-ipad-1.jpg) |
Geometry Problem 894
Triangle, Angle, 60 degrees, Incenter, Midpoint, Parallel Lines.
GeoGebra, HTML5 Animation for Tablets |
![Geometry problem 865, Parallelogram, Midpoint, Parallel](../school-college/p865-parallelogram-similarity-midpoint-parallel-1.jpg) |
Geometry Problem 865
Parallelogram, Diagonal, Midpoint, Side, Triangle, Parallel, Similarity. |
![Isolines: Adinkra Symbol Nea Onnim](../software/isoline/adinkra-nea-onnim-isolines-knowledge-learning-1.jpg) |
Geometric Art: Isolines, Adinkra Symbol, Nea Onnim No Sua a Ohu, Knowledge, Learning, Parallel Lines |
![Circumscribed trapezoid, Inscribed Circle, Tangent](../school-college/p863-circumscribed-trapezoid-circle-tangent-metric-relations-1.jpg) |
Geometry Problem 863
Circumscribed trapezoid, Inscribed Circle, Tangent, Metric Relations. |
![Trapezoid, Parallel, Equal Areas, RMS, Root Mean Square](../school-college/p862-trapezoid-parallel-equal-areas-rms-1.jpg) |
Geometry Problem 862:
Trapezoid, Parallel, Equal Areas, RMS, Root Mean Square
. |
![Triangle, Incircle, Parallel, Tangent, Metric Relations](../school-college/p861-triangle-incircle-parallel-tangent-metric-relations-1.jpg) |
Geometry Problem 861
Triangle, Incircle, Parallel, Tangent, Metric Relations. |
![Triangle, Three Medians, Parallel, Parallelogram, Area, Congruence](../school-college/p860-triangle-three-medians-area-1.jpg) |
Geometry Problem 860
Triangle, Three Medians, Parallel, Parallelogram, Area, Congruence. |
![Triangle, Circumcircle, Parallel, Chord, Side, Metric Relations](../school-college/p829-triangle-circumcircle-parallel-metric-relation-1.jpg) |
Geometry Problem 829
Triangle, Circumcircle, Parallel, Chord, Side, Metric Relations. |
![Problem 854: Triangle, Parallel lines, Parallelogram, Areas, Similarity, Concurrent lines](../school-college/p854-triangle-parallelogram-parallel-area-similarity-1.jpg) |
Geometry Problem 854
Triangle, Parallel lines, Parallelogram, Areas, Similarity, Concurrent lines. |
![Parallelogram, Angle Bisector, Parallel, Triangle, Circumcircle, Circumcenter](../school-college/p799-parallelogram-angle-bisector-circumcircle-circumcenter-1.jpg) |
Geometry Problem 799
Parallelogram, Angle Bisector, Parallel, Triangle, Circumcircle, Circumcenter. |
![Parallelogram, Secant Line, Tangent Circles, Triangle](../school-college/p798-parallelogram-secant-line-tangent-circles-1.jpg) |
Geometry Problem 798
Parallelogram, Secant Line, Tangent Circles, Circumcircles, Triangle. |
![Parallelogram, Angle Bisector](../school-college/p797-parallelogram-angle-bisector-isosceles-1.jpg) |
Geometry Problem 797
Parallelogram, Angle Bisector, Isosceles and Similar Triangles. |
![Equilateral Triangle, Parallel, Perpendicular](../school-college/p785-equilateral-triangle-parallel-perpendicular-1.jpg) |
Geometry Problem 785
Equilateral
Triangle, Parallel, Perpendicular. |
![Triangle, Two Altitudes, Circumcircle, Tangent, Parallel](../problem/p774-triangle-circumcircle-altitude-tangent-parallel-1.jpg) |
Geometry Problem 774
Triangle, Two Altitudes, Circumcircle, Tangent at a Vertex, Parallel. |
![Triangle, Circumcircle, Circumcenter, Orthocenter, Midpoint arc, Parallel chord, Congruence](../problem/p769-triangle-circumcenter-orthocenter-midpoint-arc-parallel-congruence-1.jpg) |
Geometry Problem 769
Triangle, Circumcircle, Circumcenter, Orthocenter, Midpoint of arc, Parallel to chord, Congruence. |
![Parallelogram, Diagonal, Parallel, Congruence](../problem/p763-parallelogram-diagonal-parallel-congruence-1.jpg) |
Geometry Problem 763
Parallelogram, Diagonal, Parallel, Congruence. |
![Parallelogram, Midpoint, Perpendicular, Congruence, Isosceles triangle](../problem/p762-parallelogram-midpoint-perpendicular-congruence-1.jpg) |
Geometry Problem 762
Parallelogram, Midpoint, Perpendicular, Congruence, Isosceles triangle. |
![Parallelogram, COngruence, Angle Bisector](../problem/p751-parallelogram-congruence-angle-bisector-1.jpg) |
Geometry Problem
751.
Parallelogram, Congruence, Intersecting Lines, Angle Bisector. |
![Complete Quadrilateral, Triangle, Diagonal, Parallel, Similarity](../problem/p750-complete-quadrilateral-diagonal-parallel-metric-relations-1.jpg) |
Geometry Problem
750.
Complete Quadrilateral, Triangle, Diagonal, Parallel, Similarity, Metric Relations. |
![Triangle, Rhombus, Harmonic Mean, 90 Degrees, Perpendicular](../problem/p749-triangle-rhombus-harmonic-mean-1.jpg) |
Geometry Problem
749.
Triangle, Rhombus, Parallel, Harmonic Means, Metric Relations. |
![Trapezoid, Parallel, Harmonic Mean](../problem/p747-trapezoid-diagonal-parallel-similarity-harmonic-mean-1.jpg) |
Geometry Problem
747.
Trapezoid, Diagonals, Parallel, Bases, Midpoint, Similarity, Harmonic Mean, Metric Relations. |
![Triangle, Parallel, Similarity, Harmonic Mean](../problem/p746-triangle-cevian-parallel-similarity-metric-relations-1.jpg) |
Geometry Problem
746.
Triangle, Cevian, Parallel, Similarity, Harmonic Mean, Metric Relations. |
![Triangle, Parallel, Collinear points](../problem/p391_triangle_collinear_17.jpg) |
Proposed
Problem 391.
Triangle, Parallel lines, Collinear points. |
![Triangle, Parallel, Collinear points](../problem/p390_triangle_collinear_17.jpg) |
Proposed
Problem 390.
Triangle, Parallel lines, Collinear points. |
![Triangle, Parallel, Harmonic Mean](../problem/p389_triangle_parallel_17.jpg) |
Proposed Problem 389.
Triangle, Parallel lines, Harmonic Mean. |
![Triangle, Angle bisector, Perpendicular, Parallel](../problem/p388_triangle_bisector_17.jpg) |
Proposed Problem 388.
Triangle, Angle bisector, Perpendicular, Parallel. |
![Triangle, Angle bisectors](../problem/p386_triangle_bisector_17.jpg) |
Proposed Problem 386.
Triangle, Angle bisector, Perpendicular, Parallel, Semiperimeter,
Congruence. |
![Triangle, Angle bisectors](../problem/p385_triangle_bisector_17.jpg) |
Proposed Problem 385.
Triangle, Angle bisector, Perpendicular, Parallel, Semiperimeter. |
![Triangle, Angle bisectors](../problem/p384_triangle_bisector_17.jpg) |
Proposed Problem 384.
Triangle, Angle bisector, Perpendicular, Parallel, Semiperimeter. |
![Triangle, Excenter, Parallel](../problem/p380_triangle_excenter_17.jpg) |
Proposed Problem 380.
Triangle, Excenter, Parallel to a side, Angle, Congruence. |
![Triangle, Excenter, Parallel](../problem/p379_triangle_excenter_17.jpg) |
Proposed Problem 379.
Triangle, Excenter, Parallel to a side, Angle, Congruence. |
![Triangle, Incenter, Parallel to a side](../problem/p378_triangle_incenter_17.jpg) |
Proposed Problem 378.
Triangle, Incenter, Parallel to a side, Angle, Congruence. |
![Isosceles Trapezoid, Concyclic Points](../problem/p337_concyclic_trapezoid_17.jpg) |
Proposed Problem 337.
Isosceles Trapezoid, Angle bisector, Parallel, Concyclic points. |
![Triangle, Incircle, Parallel, Midpoint](../problem/p328_triangle_incircle_17.jpg) |
Proposed Problem 328.
Triangle, Incircle, Tangency Points, Parallel, Midpoint. |
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