geometry right triangles circle pythagorean theorem circumscribed polygon inscribed polygon angles related to circles central angle inscribed angle chord circumference parts of a circle radius tangent introduction to trigonometry cosine trig identities sine prisms diagonals pythagoras pyramids pythagorean triples right triangle altitude on hypotenuse distance formula intersection collinear union similar polygons similar triangles sum of interior angles of triangle triangle midline theorem exterior angle triangle theorem aas no-choice theorem interior angles of polygons diagonals of polygons exterior angles of polygons arithmetic mean geometric mean mean/extreme proportion ratio equiangular exterior angles regular polygons
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