# Online Geometry: Triangles, Theorems and Problems

 Triangles Theorems and Problems- Page 13 Geometry Problem 624 Triangle, Incenter, Excenter, Incircle, Excircle, Similarity. Geometry Problem 623 Triangle, Incenter, Excenter, Incircle, Excircle, Concyclic Points. Geometry Problem 621 Three Rectangles, Diagonals, Centers, Angles. Geometry Problem 620 Three Rectangles, Diagonals, Centers, Angles. Geometry Problem 619 Triangle Area, 30 Degrees, Incircle, Incenter, Tangent. Geometry Problem 618 Triangle Area, 60 Degrees, Incircle, Incenter, Tangent. Geometry Problem 617 Right Triangle Area, Incircle, Incenter, Tangent, 90 Degrees. Geometry Problem 616 Parallelogram, Diagonals, Intersecting Lines, Parallel Lines. Geometry Problem 615 Right Triangle with a Square, Diagonals, Center, Area of Quadrilateral. Geometry Problem 614 Parallelogram, Diagonals, Intersecting Lines, Parallel Lines. Geometry Problem 613 Altitude of a Triangle, Perpendicular, Collinear Points. Geometry Problem 612 Altitude of a Triangle, Perpendicular, Congruence. Geometry Problem 611 Altitude of a Triangle, Perpendicular, Collinear Points, Parallel. Geometry Problem 609 Triangle, Perpendiculars, 90 Degrees, Collinearity. Geometry Problem 608 Square with Right Triangles, Metric Relations, Congruence, Measurement. Geometry Problem 607 Intersecting Circles, Triangles, Metric Relations, Measurement. Geometry Problem 606 Isosceles Triangles, Perpendicular and Parallel Lines. Geometry Problem 604 Parallelograms, Triangle, Trapezoid, Area. Geometry Problem 602 Triangle, Angles, 30 and 45 Degrees, Cevian, Congruence. Geometry Problem 597 Quadrilateral, Right Triangle, Isosceles, Angle, Congruence.

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