The Elements of Geometry

altitude angle formed angles equal base and altitude bisector bisects central angle chord circumference Conc concur CONCURRENT LINES cone congruent Const construct cylinder diagonals diameter dihedral distance divided Draw drawn equals the sum exterior figure Find frustum geometry given circle given line given point homologous hypotenuse inscribed intercepted arcs interior angles intersect isoangular isosceles triangle join K₁ line-segment locus measured by arc median mid-join mid-perpendicular mid-point n-gon number of sides opposite parallel parallelepiped parallelogram pass perimeter perpendicular plane MQ point equidistant prism Prob PROBLEM proof proportion Prove pyramid radii ratio rectangle regular polygon right angle right circular right triangle secant segment similar slant height sphere spherical spherical polygon square straight line SUMMARY OF PROPOSITIONS supplemental tangent theorem total surface transversal trapezoid triangle equals vertex angle vertices volume