Robbin's New Plane Geometry

ABCD adjoining altitude approaches base bisector bisects chord circle circumference circumscribed common congruent construct contains COROLLARY cutting described diagonals diameter difference divided Draw drawn ends equally distant equiangular equilateral triangle exterior angle external extremities feet figure Find Find the area formed four given circle given line given point greater half Hence hexagon homologous hypotenuse inches inscribed intercepted intersecting isosceles triangle length limit line joining mean measured median meeting midpoint NOTE opposite sides original pair parallel parallelogram perimeter perpendicular plane polygon PROBLEM produced Proof proportional PROPOSITION Prove Q.E.D. PROPOSITION quadrilateral radii radius ratio rectangle regular polygon Required respectively right angle right triangle secant segments showing sides similar square Statement straight line Substituting Suppose tangent THEOREM third trapezoid triangle equal unit vertex vertices