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Geometry Problems 631-640: Triangle,
Collinearity, Incenter, Circle, Arbelos
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Geometry Problems 631 - 640
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![Triangle, Angle Bisectors, Collinear](../problem/p631_triangle_bisector_1.jpg) |
Geometry Problem 631.
Triangle, Exterior Angle Bisectors, Collinear Points. |
![Triangle, Angle Bisectors, Midpoint, Collinear](../problem/p632_triangle_collinear_1.jpg) |
Geometry Problem 632.
Triangle, Interior and Exterior Angle Bisectors, Midpoints, Collinear Points. |
![Triangle, Parallel Lines, Intersecting Lines](../problem/p633_triangle_parallel_1.jpg) |
Geometry Problem 633
Triangle, Parallel Lines, Intersecting Lines. |
![Right triangle, Altitude, Incenter, Area](../problem/p634_right_triangle_area_1.jpg) |
Geometry Problem 634
Right Triangle, Altitude, Incenters, Areas.
Geometric
art of problem 634. Background: stereographic projection of the Temple of the Three Windows at Machu Picchu |
![Semicircle, Perpendicular, Inscribed Circle, Radius](../problem/p635_circle_radius_1.jpg) |
Geometry Problem 635
Semicircle, Diameter, Perpendicular, Inscribed Circle, Radius. |
![Semicircle, Perpendicular, Inscribed Circle, Tangent](../problem/p636_tangent_circle_1.jpg) |
Geometry Problem 636
Semicircle, Diameter, Perpendicular, Inscribed Circle, Common Tangent. |
![Semicircle, Perpendicular, Inscribed Circle, Tangent, Chord](../problem/p637_arbelos_circle_1.jpg) |
Geometry Problem 637
Semicircle, Diameter, Perpendicular, Inscribed Circle, Chord, Tangent, Arbelos. |
![Arbelos, Circle, Concyclic Points](../problem/p638_arbelos_circle_1.jpg) |
Geometry Problem 638
Arbelos and Inscribed Circle: Concyclic Points. |
![Semicircle, Perpendicular, Inscribed Circle, Tangent, Congruence](../problem/p639_arbelos_circle_1.jpg) |
Geometry Problem 639
Semicircle, Diameter, Perpendicular, Inscribed Circle, Tangent, Arbelos, Congruence. |
![Archimedes Book of Lemmas Proposition 1](../problem/p640_archimedes_lemma_01_1.jpg) |
Geometry Problem 640.
Archimedes Book of Lemmas: Proposition 1
Tangent circles and parallel diameters |
![Archimedes Book of Lemmas Proposition 1](../problem/p640-archimedes-lemmas-01-typography-etching-software-1.jpg) |
Etching and Typography of Geometry Problem 640.
Archimedes Book of Lemmas: Proposition 1
Using iPad Apps. |
![Geometry problems 621-630](geometry_problems_621_630_1.jpg)
![Geometry problems 641-650](geometry_problems_641_650_1.jpg) |
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