Introductory Modern Geometry of Point, Ray, and Circle

ABCD Algebra altitude anti-parallelogram bisect called central angle central symmetry centre of similitude centre of symmetry chord circle K circumcircle circumscribed collinear concur congruent conjugate construct conversely corresponding cosine Data diagonal diameter dimensions distances divide draw a circle drawn Elementary Algebra encyclic equal angles equidistant fixed point geometric given point given ray half-rays harmonic hence homœoidal hypotenuse innerly inscribed intercepts intersection inverse join Let the student magnitude medial metric numbers mid-normal mid-points normal opposite angles opposite sides outer outerly pairs parallel parallelogram perimeter plane points of touch polar pole polygon position power-axis Problem Proof proportion Q. E. D. Corollary radius ratio reciprocal rectangle regular n-side rhombus right angle round angle secant similar figures sine Solution Space square straight angle subtended surface symmetric tangent Theorem tract Trigonometry vertex vertices