Elements of Geometry

A A BC acute altitude arc A B base bisect called centre chord circle circumference circumscribed coincide common Cons construct contained COROLLARY describe diagonals diameter difference direction divided Draw equal distances equal respectively equilateral equivalent erected extremities fall figure formed four given greater Hence homologous sides hypotenuse included inscribed intercept intersect isosceles joining less Let A B limit line A B line drawn mean measured meet middle point multiplied one-half opposite sides parallelogram perimeter perpendicular placed plane position PROBLEM proportional prove Q. E. D. PROPOSITION quantities radii radius equal ratio rect rectangles regular polygon right angles segment Show similar similar polygons square straight line Substitute subtend surface symmetrical Take taken tangent THEOREM triangle variable vertex vertices