Triangles: Theorems and Problems 18




Proposed
Problem 415.
Right
Triangle, Cevian, Angles, Congruence. 

Proposed
Problem 414.
Triangle, Angles, Altitude, Median, Congruence. 

Proposed
Problem 412.
Triangle, Angles, Congruence. 

Proposed
Problem 411.
Triangle, Median, Angles. 

Proposed
Problem 410.
Two Regular Pentagons, Angle, Triangle Congruence. 

Proposed
Problem 409.
Quadrilateral, Diagonals, Perpendicular, Congruence, Triangle. 

Proposed
Problem 408.
Cyclic quadrilateral, Perpendicular, Parallelogram, Congruence, Triangle. 

Proposed
Problem 406.
Right triangle, 15 degrees, Midpoints, Congruence. 

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

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 397.
Triangle, Altitude, Midpoints, Congruence. 

Proposed
Problem 395.
Square, 15 Degree, Equilateral triangle. 

Proposed
Problem 393.
Triangle, Orthocenter, Circumcircles, Congruence, Collinear. 

Proposed
Problem 392.
Triangle, Parallel lines, Concurrent lines. 

Proposed
Problem 391.
Triangle, Parallel lines, Collinear points. 

Proposed
Problem 390.
Triangle, Parallel lines, Collinear points. 

Proposed
Problem 389.
Triangle, Parallel lines, Harmonic Mean. 

Proposed
Problem 388.
Triangle, Angle bisector, Perpendicular, Parallel. 

Proposed
Problem 387.
Triangle, Angle bisector, Perpendicular, Concyclic points. 

Proposed
Problem 386.
Triangle, Angle bisector, Perpendicular, Parallel, Semiperimeter,
Congruence. 

Proposed
Problem 385.
Triangle, Angle bisector, Perpendicular, Parallel, Semiperimeter. 

Proposed
Problem 384.
Triangle, Angle bisector, Perpendicular, Parallel, Semiperimeter. 

Proposed
Problem 380.
Triangle, Excenter, Parallel to a side, Angle, Congruence. 

Proposed
Problem 379.
Triangle, Excenter, Parallel to a side, Angle, Congruence. 

Proposed
Problem 378.
Triangle, Incenter, Parallel to a side, Angle, Congruence. 

Proposed
Problem 377.
Triangle, Internal Angle Bisector, Altitude. 

Proposed
Problem 376.
Triangle, Excenter, Internal and External Angle Bisectors. 

Proposed
Problem 375.
Triangle, Excenter, External Angle Bisectors. 
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