The Elements of Plane Geometry

ABCD AC is equal adjacent angles altitude angle ABC angle ACB angle BAC angle DAE angle DEF angle equal angle HBK base bisectors chord HK circle ABC circle whose centre circles touch circumscribing circle coincide Constr diagonal diameter distance duplicate ratio equal angles equal to CD equiangular exterior angle given angle given circle given point given ratio given straight line greater half the angle Hence hypotenuse identically equal inscribed isosceles triangle less Let ABC line joining magnitudes meet the circumference middle point minor arc opposite angle opposite sides parallelogram perpendicular PLANE GEOMETRY point equidistant polygon Prob produced Prove quadrilateral radii radius ratio compounded rectangle AC rectangle contained rectilineal figure rhombus right angles segment BAC Shew side BC square on AC straight line drawn tangent THEOR Theorem triangle ABC triangle DEF twice the rectangle vertical angle