Online Geometry: Congruence, Rotation, Translation, Reflection - Page 6
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![Congruence, Translation, Rotation, Reflection](congruence_geometry_17.jpg) |
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![](../problem/p078_circle_angles_17.jpg) |
Proposed Problem 78: Angles of a Circle.
Perpendicular and parallel lines, Midpoint, Diameter, Chord, Cyclic
quadrilateral, Congruence.
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![](../problem/p065_right_triangle_17.jpg) |
Proposed Problem 65: Right Triangle, Mindpoints. |
![Hinged tessellation, Dynamic geometry](../javacar/hinged_tessellation_170.jpg) |
Interactive Hinged tessellation. Square tessellation - Dynamic Geometry.
Please be patient while the applet loads on your computer. This Java
applet requires Java 1.3 or higher. |
![](../ArchBooLem05_170.jpg) |
Archimedes' Book of Lemmas.
Proposition 5,
Arbelos, Archimedean Twins.
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![Geometry Expressions](geometry_expressions_01a17.jpg) |
I have
used Geometry Expressions, the world's first Interactive
Symbolic Geometry System, to visualize the Archimedean Twins and
check out a variety of conjectures.
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![](../problem/p060_isosceles_triangle_17.jpg) |
Proposed Problem 60: Isosceles
triangle and angles. |
![](../problem/p059_right_equilateral_17.jpg) |
Proposed Problem 59: Right and Equilateral Triangles, Midpoints |
![](../problem/p058_pythagoras_congruence_.jpg) |
Proposed Problem 58: Right Triangle, Congruence, Perpendiculars. |
![](../triangle_square/triangle_square_22_170.jpg) |
Triangle and Squares 22
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![](../triangle_square/triangle_square_20_170.jpg) |
Triangle and Squares
20
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![](../problem/p049_right_triangle_170.jpg) |
Proposed Problem 49.
Angles and right triangle.
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![](../problem/p048_angle_triangle_170.jpg) |
Proposed Problem 48.
Angles and triangles.
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![](../problem/p047_angle_triangle_170.jpg) |
Proposed Problem 47.
Angles and triangles.
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![](../problem/p046_angle_triangle_170.jpg) |
Proposed Problem 46.
Angles and triangles.
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![](../problem/p045_angle_triangle_170.jpg) |
Proposed Problem 45.
Angles and triangles.
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![](../problem/p044_angle_triangle_170.jpg) |
Proposed Problem 44.
Angles and triangles.
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![](../problem/p043_angle_triangle_170.jpg) |
Proposed Problem 43.
Angles and triangles. |
![](../problem/p042_angle_triangle_170.jpg) |
Proposed Problem 42.
Angles and triangles. |
![](../problem/p037_right_triangle_170.jpg) |
Proposed
Problem 37.
Right Triangle, altitude, incircles, incenters, and orthocenter. |
![](../triangle_square/triangle_square_16_170.jpg) |
Triangle and Squares
16
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![](../triangle_square/triangle_squares_14x170.jpg) |
Triangle and Squares
14 |
![](../triangle_square/triangle_squares_13x170.jpg)
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Triangle and Squares 13 |
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