Online Geometry: Congruence, Rotation, Translation, Reflection - Page 5

Geometry Problem 625
Triangle, Parallel Lines, Congruence, Angle Bisector.

Geometry Problem 612
Altitude of a Triangle, Perpendicular, Congruence.

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

Geometry Problem 608
Square with Right Triangles, Metric Relations, Congruence, Measurement.

Geometry Problem 592.
Triangle, Incenter, Incircle, Tangency Point, Midpoints, Concurrent Lines, Congruence.

Geometry Problem 591.
Triangle, Incenter, Incircle, Inradius, Tangency Point, Midpoint, Altitude.

Problem 570.
Square, Center, Right Triangles, Congruence, Collinearity.

Problem 569.
Quadrilateral, Excircles, Tangency Points, Congruence.

Problem 568.
Triangle, Excircles, Tangency Point, Congruence.

Proposed Problem 404.
External Equilateral triangles, Congruent and Concurrent Lines.

Proposed Problem 402.
Hexagon, Triangle, Centroid, Parallel, Congruence, Similarity.

Proposed Problem 401.
Area, Triangle, Angle bisector, Circumcircle, Perpendicular bisector, Congruence.

Proposed Problem 400.
Triangle, Angle bisector, Circumcircle, Perpendicular, Congruence.

Proposed Problem 399.
Right triangle, Midpoints, Distance, Pythagorean theorem, Congruence.

Proposed Problem 398.
Parallelogram, Area, Similarity, Congruence.

Proposed Problem 397.
Triangle, Altitude, Midpoints, Congruence.

Proposed Problem 396.
Square, Angle Trisectors, Congruence, Area.

Proposed Problem 394.
Square, 90 Degree Arc, Diagonal, Congruence.

Proposed Problem 363.
Right triangle, Congruence, Angles.

Proposed Problem 358.
Isosceles triangle 80-80-20, Circle, Angles, Congruence.

Proposed Problem 274.
Isosceles Triangle, 80-80-20, Angles.

Equilic Quadrilateral.
 

Proposed Problem 219. Rhombus, perpendiculars, arithmetic mean.

Proposed Problem 218. Right triangle, Altitude and Projections.

Proposed Problem 217. Right triangle, Altitude and Projections.

Proposed Problem 187. Right Triangle, Altitude, Incenters, Circles, Angles.

Proposed Problem 186. Right Triangle, Altitude, Incenters, Circles.

Proposed Problem 185. Trapezoid, Triangles and Angles.

Proposed Problem 184. Triangle and Angles.

Proposed Problem 158. Relation between the Circumradius, Inradius and Exradii of a triangle.

Proposed Problem 147. Quadrilateral, Area, Midpoints, Triangle.

Proposed Problem 135. Orthic Triangle, Altitudes, Perpendicular, Parallel

Proposed Problem 132.
Triangle, 60 degree, Orthocenter, Congruence, Midpoint.
 

Triangle with Squares Problem

Proposed Problem 109. Angles, Right Triangle, Cevian.

Proposed Problem 107. Angles, Triangle. Cevian.

Proposed Problem 106. Angles, Triangle. Cevian.

The Pythagorean Curiosity Triangles and squares, fifteen conclusions.

Proposed Problem 103.Equilateral Triangle Area, Interior Point, Heron's Formula.

Triangle and Squares Theorem 1: with Interactive Geometry Software
Step-by-Step construction, Manipulation, and animation.

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