The Elements of Geometry

ABCD adjacent angles alternate angles altitude angles are equal angles equal angles opposite base bisect called chord circumcenter coincide common commutative law CONCLUSION construction COROLLARY cross-ratio describe diagonals diameter divided draw end point equal circles equal sects equiangular equivalent exterior angle figure geometry given line given point given sect greater hypothenuse HYPOTHESIS included angle inscribed inscribed angle intercepted interior isosceles triangle less lune magnitudes meet multiples number of sides pair parallelogram pass perigon perimeter perpendicular bisector plane MN prismatoid PROOF quadrant quadrilateral radii radius ratio rectangle rectangle contained Reflex Angle regular polygon right angle Rule of Inversion sect drawn sect joining segment sphere spherical polygon spherical triangle square straight angle subtended supplemental surface symmetrical tangent tetrahedron THEOREM THEOREM VIII transversal triangles are congruent vertex