Elements of Geometry with Exercises for Students: An an Introduction to Modern Geometry

ABCD adjacent angles altitude angles are equal angles formed anharmonic ratio axis base bisector bisects central angles chord circumference circumscribed polygon coincide common cone construct Corollaries cylinder diagonals diameter dihedral angles distance divided draw equal angles equally distant equiangular equiangular polygon equilateral equivalent exterior angle facial angles frustum given line given point given straight line greater harmonic hence homologous hypotenuse indefinitely inscribed angle isosceles lateral edges Let ABC locus middle point number of sides oblique obtuse opposite sides parallelogram parallelopiped pendicular perimeter perpendicular plane angles plane embracing point of tangency polar pole polyhedral angle polyhedrons prism produced proportional Proposition pyramid quadrilateral radical axis radii radius rectangle regular polygon respectively equal right triangle secant segments similar sphere spherical polygon spherical triangle square surface tangent tetrahedron third side triangle ABC trihedral vertex vertices