Triangles: Theorems and Problems 13
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![Triangles](../geometry/triangles_index_17.jpg) |
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![Triangle, Incenter, Excenter, Similarity](../problem/p624_incenter_excenter_1.jpg) |
Geometry Problem 624
Triangle, Incenter, Excenter, Incircle, Excircle, Similarity. |
![Triangle, Incenter, Excenter, Concyclic Points](../problem/p623_incenter_excenter_1.jpg) |
Geometry Problem 623
Triangle, Incenter, Excenter, Incircle, Excircle, Concyclic Points. |
![Two Parallelograms, Center, Parallel](../problem/p621_two_parallelograms_1.jpg) |
Geometry Problem 621
Three Rectangles, Diagonals, Centers, Angles. |
![Three Rectangles, Centers, Angles](../problem/p620_three_rectangles_1.jpg) |
Geometry Problem
620
Three Rectangles, Diagonals, Centers, Angles. |
![Triangle Area, 30 Degrees, Incircle](../problem/p619_triangle_30_area_1.jpg) |
Geometry Problem
619
Triangle Area, 30 Degrees, Incircle, Incenter, Tangent. |
![Triangle area, 60 degrees](../problem/p618_triangle_60_area_1.jpg) |
Geometry Problem
618
Triangle Area, 60 Degrees, Incircle, Incenter, Tangent. |
![Right triangle area](../problem/p617_triangle_90_area_1.jpg) |
Geometry Problem
617
Right Triangle Area, Incircle, Incenter, Tangent, 90 Degrees. |
![Parallelogram, Diagonal, Parallel](../problem/p616_parallelogram_1.jpg) |
Geometry Problem
616
Parallelogram, Diagonals, Intersecting Lines, Parallel Lines. |
![Triangle, Square, Area](../problem/p615_triangle_square_1.jpg) |
Geometry Problem
615
Right Triangle with a Square, Diagonals, Center, Area of Quadrilateral. |
![Parallelogram, Diagonal, Parallel](../problem/p614_parallelogram_1.jpg) |
Geometry Problem
614
Parallelogram, Diagonals, Intersecting Lines, Parallel Lines. |
![Triangle, Altitude, Collinearity](../problem/p613_altitude_triangle_1.jpg) |
Geometry Problem
613
Altitude of a Triangle, Perpendicular, Collinear Points. |
![Triangle, Altitude, Congruence](../problem/p612_altitude_triangle_1.jpg) |
Geometry Problem
612
Altitude of a Triangle, Perpendicular, Congruence. |
![Triangle, Altitude, Collinearity](../problem/p611_altitude_triangle_1.jpg) |
Geometry Problem
611
Altitude of a Triangle, Perpendicular, Collinear Points, Parallel. |
![Triangle, Perpendiculars, Collinearity](../problem/p609_triangle_collinear_1.jpg) |
Geometry Problem
609
Triangle, Perpendiculars, 90 Degrees, Collinearity. |
![Square with Right triangles](../problem/p608_square_triangle_1.jpg) |
Geometry Problem
608
Square with Right Triangles, Metric Relations, Congruence, Measurement. |
![Intersecting Circles](../problem/p607_intersecting_circles_1.jpg) |
Geometry Problem
607
Intersecting Circles, Triangles, Metric Relations, Measurement. |
![Isosceles triangle](../problem/p606_isosceles_triangle_1.jpg) |
Geometry Problem
606
Isosceles Triangles, Perpendicular and Parallel Lines. |
![Parallelogram Area](../problem/p604_parallelogram_area_1.jpg) |
Geometry Problem
604
Parallelograms, Triangle, Trapezoid, Area. |
![Triangle, Angle, Congruence](../problem/p602_triangle_congruence_1.jpg) |
Geometry Problem
602
Triangle, Angles, 30 and 45 Degrees, Cevian, Congruence. |
![Quadrilateral, 90 degrees, congruence](../problem/p597_right_triangle_1.jpg) |
Geometry Problem 597
Quadrilateral, Right Triangle, Isosceles, Angle, Congruence. |
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