The Harpur Euclid: An Edition of Euclid's Elements

ABCD base bisect bisector Book called centre chord circum-circle circumference coincide common constant construction converse demonstration described diagonals diameter distance divided draw drawn equal equilateral Euclid exercise external falls figure fixed four given circle given point given straight line greater Hence inscribed intersect Join length less lies locus magnitude mean meet method mid-point NOTE opposite sides parallel parallelogram pass perpendicular plane problem produced Prop proportional PROPOSITION prove quadrilateral radius ratio rect rectangle contained rectilineal figure regular reqd respectively right angles segment Show shown sides similar Similarly square student Take taken tangent THEOREM third touch triangle ABC twice vertex vertices whole