Plane Geometry

AABC ABCD ADEF adjacent angles altitude Analysis angles are equal angles equal apothem base bisects central angle chord circumscribed coincide congruent triangles const Construct Converse corresponding angles corresponding sides diagonals diameter distance divide draw drawn equal angles equal arcs equal circles equal in area equally distant equilateral triangle EXERCISES Ex exterior angle external point external tangent figure Find the area Find the locus geometry given circle given line segment Hence hypotenuse inscribed angle intersection isosceles triangle length line parallel mean proportional meet method middle point number of sides opposite side pairs parallel lines parallelogram perimeter perpendicular bisector plane preceding exercise Proof Prove quadrilateral radii radius ratio rectangle regular polygon rhombus right angles right triangle secant similar triangles square straight line theorem transversal trapezoid triangle is equal unequal vertex vertices