Triangles: Theorems and Problems 16

Problem 493.
Right Triangle, Circumcircle, Perpendicular, Chord.

Problem 489.
Parallelogram, Triangle, Quadrilateral, Area.

Problem 488.
Triangle, Cevian, Concurrency, Circle, Circumcircle.

Problem 482.
Triangle, Circumcircle, Incenter, Excenter, Midpoint, Cyclic Points.

Problem 481.
Triangle, Altitude, Cevian, Perpendicular, Angle.

Problem 480.
Triangle, Circle, Center, Altitude, Angle, Circumcenter.

Problem 479.
Triangle, Cevians, Concurrency, Transversal, Proportion.

Problem 478.
Triangle, Sides, Circumradius, Circumcenter, Circumcircle.

Problem 477.
Parallelogram, Triangle, Quadrilateral, Area.

Problem 476.
Triangle, Circumcenter, Circumcircle, Angles.

Problem 473.
Triangle, Parallel, Side, Parallelogram, Area, Similarity.

Problem 472.
Triangle, Parallel, Side, Parallelogram, Area, Similarity.

Problem 471.
Triangle, Parallel, Side, Concurrency, Area, Similarity.

Problem 470.
Triangle, Parallel, Side, Parallelogram, Area, Similarity.

Proposed Problem 469.
Isosceles triangle, Midpoint, Transversal, Congruence.

Proposed Problem 463.
Three Concentric Circles, Secant, Tangent, Triangle, Area.

Proposed Problem 459.
Right triangle, Squares, Distance, Measurement.

Proposed Problem 457.
Triangle, First Brocard Point, Congruent angles, Circle, Circumradius.

Proposed Problem 454.
Triangle, Incircle, Inradius, Tangent, Circle, Radius.

Proposed Problem 452.
Triangle, Circle, Tangent, Proportional Segments.