College Geometry Online, eLearning

Online Math: Geometry: Midpoint, Theorems and Problems


Midpoint, Theorems and Problems - Index (Page 1)

Midpoint Index

Point, Theorems and Problems, Index

Points, Theorems and Problems - Index.

Perpendicular Bisector Index

Perpendicular Bisector.

Butterfly Theorem Proof with animation.
Midpoint of a chord.

Trapezoid median, Theorems and Problems, Index

Median of a Trapezoid, Theorems and Problems. Index.

Newton's Theorem: Newton's Line. Circumscribed quadrilateral, midpoints of diagonals, center of the circle inscribed.

Dynamic Geometry: Nine Point Circle. HTML5 Animation for Tablets (iPad, Nexus..)

GeoGebra, Dynamic Geometry: Nine Point Circle
HTML5 Animation for Tablets (iPad, Nexus..)

Dynamic Geometry: Internal Feuerbach Point. HTML5 Animation for Tablets iPad, Nexus

GeoGebra, Dynamic Geometry: Internal Feuerbach Point
HTML5 Animation for Tablets (iPad, Nexus..)

Equilic Quadrilateral.
120 degrees.

Kurschak's Tile and Theorem. Jozsef Kurschak (Hungary, 1864-1933) An elegant and a purely geometric way of finding the area of a regular dodecagon.

Varignon and Wittenbauer parallelograms. Quadrilateral: midpoints and trisection points of the edges.


Median Length theorem

Median length, Apollonius' Theorem

Van Aubel

Van Aubel's Theorem. Quadrilateral with Squares. Proof with animation.

Symmedian (Lemoine) Point
Triangle Center

Archimedes' Book of Lemmas: Proposition 7
Square and inscribed and circumscribed Circles

Archimedes' Book of Lemmas: Proposition 2
Semicircle, diameter, tangents, secant line. 

Archimedes' Book of Lemmas: Proposition 3
Semicircle, perpendicular to diameter, chords.

Archimedes' Book of Lemmas: Proposition 10
Tangents to a circle, secant line and chords, Parallel.

Archimedes' Book of Lemmas: Proposition 15
Circle, Diameter, Inscribed Regular Pentagon, Arc, Midpoint, Perpendicular, Radius

Bottema Theorem. Elearning.

Bottema's Theorem:
Triangle and Squares with Interactive Geometry Software
Step-by-Step construction, Manipulation, and animation.

Eight Point Circle Theorem. Elearning

Eight-Point Circle Theorem
Step-by-Step construction, Manipulation, and animation.
Perpendiculars from the midpoints.

Marion Walter's Theorem: Triangle and Hexagon areas: Using TracenPoche Dynamic Geometry Software.

Nine-Point Center, Nine-Point Circle, Euler Line.
Interactive illustration.

Mascheroni Construction with compass alone. Midpoint of a segment.

Heron's Formula with medians.

Mittenpunkt Point

Brahmagupta's Theorem

Dynamic Geometry: Brahmagupta Theorem, . GeoGebra, HTML5 Animation for Tablets

Geometry problem 1317

Geometry Problem 1317.
Triangle, Excircle, Chord, Tangent, Midpoint, Arc, Sum of two Segments, Congruence.

Geometry problem 1316

Geometry Problem 1316.
Triangle, Incircle, Tangent, Chord, Midpoint, Sum of two Segments, Congruence.

Geometry problem 1302

Geometry Problem 1302.
Triangle, Median, Midpoint, Circles, Diameters, Congruence.

Geometry problem 1301

Geometry Problem 1301.
Arbelos, Semicircles, Diameters, Circle, Incircle, Incenter, Square, Midpoint, Concurrency.

Geometry problem 1298

Geometry Problem 1298.
Arbelos, Semicircles, Diameters, Circle, Incircle, Tangent, Angle Bisector, Perpendicular, Midpoint.

Geometry problem 1294

Geometry Problem 1294.
Triangle, Altitudes, Four Squares, Center, Midpoint, Concyclic Points.

Geometry problem 1293

Geometry Problem 1293.
Triangle, Altitudes, Two Squares, Center, Concurrent Lines, Midpoint.

Geometry problem 1291

Geometry Problem 1291.
Three Squares, Collinear Vertices, Midpoint, Congruence.

Geometry problem 1290

Geometry Problem 1290.
Triangle, Internal Angle Bisector, Median, Parallel, Measurement, Metric Relations.

Geometry problem 1284

Geometry Problem 1284.
Two Equilateral Triangle, Midpoint, Congruence.

Geometry problem 1283

Geometry Problem 1283.
Two Equilateral Triangle, Perpendicular, Midpoint.

Geometry problem 1282

Geometry Problem 1282.
Three Squares, Common Vertex, Midpoint, Perpendicular, 90 Degrees.

Geometry problem 1279

Geometry Problem 1279.
Parallelogram, Midpoint, Triangle, Area, 3/10.

Geometry problem 1278

Geometry Problem 1278.
Square, 3-4-5 Right Triangle, Midpoint.

Geometry problem 1273

Geometry Problem 1273.
Circle, Tangent, Secant, Midpoint, Isogonal Lines, Congruent Angles.

Geometry problem 1272

Geometry Problem 1272.
Isosceles Triangle, Median, Midpoint, Perpendicular, 90 Degrees, Angles, Congruence.

Geometry problem 1263

Geometry Problem 1263.
Triangle, Medians, 90 Degrees, Perpendicular.

Geometry problem 1262

Geometry Problem 1262.
Isosceles Triangle, Altitude, Medians, 90 Degrees, Perpendicular.

Geometry problem 1261

Geometry Problem 1261.
Cyclic Quadrilateral, Circle, Diameter, Midpoint, Measurement.

Geometry problem 1254

Geometry Problem 1254.
Circle, Arc, Chord, Midpoint, Cyclic Quadrilateral, Concyclic Points.

Geometry problem 1247

Geometry Problem 1247.
Triangle, Circumcircle, Orthocenter, Altitude, Perpendicular, Midpoint.

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Last updated: Feb 21, 2017