Plane Geometry

acute angle adjacent angles altitude angle equal angle formed angles are equal apothem arc AC arc CD AXIOM bisects called central angle circumscribed congruent triangles corresponding sides diagonals diameter divided drawn end points equal angles equal circles equal respectively equidistant equilateral triangle exterior angle figure for Ex given circle given line segment given point hypotenuse included angle included side inscribed angle intercepted arc isosceles lateral area length line parallel major arc minor arc number of sides opposite sides parallel lines parallelogram perimeter perpendicular bisector point of intersection Proof Prove Theorem quadrilateral radii radius ratio rectangle regular polygon rhombus right angle right triangle secant side BC similar polygons square straight angle straight line supplementary angles tangent Theorem third side three sides transversal trapezoid triangle are equal unequal vertex vertices ᎠᏴ