Triangles: Theorems and Problems 18
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![Triangles](../geometry/triangles_index_17.jpg) |
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![Right triangle, Cevian, Angle, Congruence](../problem/p415_right_triangle_angle_1.jpg) |
Proposed
Problem 415.
Right
Triangle, Cevian, Angles, Congruence. |
![Triangle, Angle, Median, Altitude, Congruence](../problem/p414_triangle_angle_17.jpg) |
Proposed
Problem 414.
Triangle, Angles, Altitude, Median, Congruence. |
![Triangle, Angles, Congruence](../problem/p412_triangle_angles_17.jpg) |
Proposed
Problem 412.
Triangle, Angles, Congruence. |
![Triangle, Median, Angles](../problem/p411_triangle_median_angle_.jpg) |
Proposed
Problem 411.
Triangle, Median, Angles. |
![Regular pentagons, Angle](../problem/p410_regular_pentagon_17.jpg) |
Proposed
Problem 410.
Two Regular Pentagons, Angle, Triangle Congruence. |
![Quadrilateral, Angles, Diagonals, Perpendicular](../problem/p409_angle_quadrilateral_17.jpg) |
Proposed
Problem 409.
Quadrilateral, Diagonals, Perpendicular, Congruence, Triangle. |
![Cyclic quadrilateral, Perpendicular, Parallelogram, Congruence](../problem/p408_cyclic_quadrilateral_1.jpg) |
Proposed
Problem 408.
Cyclic quadrilateral, Perpendicular, Parallelogram, Congruence, Triangle. |
![Right triangle, 15 degrees](../problem/p406_right_triangle_15_30_1.jpg) |
Proposed
Problem 406.
Right triangle, 15 degrees, Midpoints, Congruence. |
![Equilateral triangles](../problem/p404_equilateral_triangle_1.jpg) |
Proposed
Problem 404.
External Equilateral triangles, Congruent and Concurrent Lines. |
![Area of a triangle, Circumcircle, Angle Bisector](../problem/p401_area_triangle_17.jpg) |
Proposed
Problem 401.
Area, Triangle, Angle bisector, Circumcircle, Perpendicular bisector, Congruence. |
![Triangle, Angle Bisector, Circumcircle](../problem/p400_triangle_circle_17.jpg) |
Proposed
Problem 400.
Triangle, Angle bisector, Circumcircle, Perpendicular, Congruence. |
![RIght triangle, Midpoints, Distance](../problem/p399_right_triangle_17.jpg) |
Proposed
Problem 399.
Right triangle, Midpoints, Distance, Pythagorean theorem, Congruence. |
![Triangle, Altitude](../problem/p397_triangle_midpoint_17.jpg) |
Proposed
Problem 397.
Triangle, Altitude, Midpoints, Congruence. |
![Square, 15 degree](../problem/p395_square_15_degree_17.jpg) |
Proposed
Problem 395.
Square, 15 Degree, Equilateral triangle. |
![Triangle, Orthocenter](../problem/p393_triangle_orthocenter_1.jpg) |
Proposed
Problem 393.
Triangle, Orthocenter, Circumcircles, Congruence, Collinear. |
![Triangle, Parallel, Concurrent lines](../problem/p392_triangle_collinear_17.jpg) |
Proposed
Problem 392.
Triangle, Parallel lines, Concurrent lines. |
![Triangle, Parallel, Collinear points](../problem/p391_triangle_collinear_17.jpg) |
Proposed
Problem 391.
Triangle, Parallel lines, Collinear points. |
![Triangle, Parallel, Collinear points](../problem/p390_triangle_collinear_17.jpg) |
Proposed
Problem 390.
Triangle, Parallel lines, Collinear points. |
![Triangle, Parallel, Harmonic Mean](../problem/p389_triangle_parallel_17.jpg) |
Proposed
Problem 389.
Triangle, Parallel lines, Harmonic Mean. |
![Triangle, Angle bisector, Perpendicular, Parallel](../problem/p388_triangle_bisector_17.jpg) |
Proposed
Problem 388.
Triangle, Angle bisector, Perpendicular, Parallel. |
![Triangle, Angle Bisector, Perpendicular, Concyclic points](../problem/p387_triangle_bisector_17.jpg) |
Proposed
Problem 387.
Triangle, Angle bisector, Perpendicular, Concyclic points. |
![Triangle, Angle bisectors](../problem/p386_triangle_bisector_17.jpg) |
Proposed
Problem 386.
Triangle, Angle bisector, Perpendicular, Parallel, Semiperimeter,
Congruence. |
![Triangle, Angle bisectors](../problem/p385_triangle_bisector_17.jpg) |
Proposed
Problem 385.
Triangle, Angle bisector, Perpendicular, Parallel, Semiperimeter. |
![Triangle, Angle bisectors](../problem/p384_triangle_bisector_17.jpg) |
Proposed
Problem 384.
Triangle, Angle bisector, Perpendicular, Parallel, Semiperimeter. |
![Triangle, Excenter, Parallel](../problem/p380_triangle_excenter_17.jpg) |
Proposed
Problem 380.
Triangle, Excenter, Parallel to a side, Angle, Congruence. |
![Triangle, Excenter, Parallel](../problem/p379_triangle_excenter_17.jpg) |
Proposed
Problem 379.
Triangle, Excenter, Parallel to a side, Angle, Congruence. |
![Triangle, Incenter, Parallel to a side](../problem/p378_triangle_incenter_17.jpg) |
Proposed
Problem 378.
Triangle, Incenter, Parallel to a side, Angle, Congruence. |
![Triangle, Altitude, Angle bisector](../problem/p377_triangle_altitude_17.jpg) |
Proposed
Problem 377.
Triangle, Internal Angle Bisector, Altitude. |
![Triangle, Excenter, Internal and External angle bisector,](../problem/p376_triangle_excenter_17.jpg) |
Proposed
Problem 376.
Triangle, Excenter, Internal and External Angle Bisectors. |
![Triangle, Excenter, Angle](../problem/p375_triangle_excenter_17.jpg) |
Proposed
Problem 375.
Triangle, Excenter, External Angle Bisectors. |
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