Elements of Plane and Solid Geometry

AABC ABē ABC and DEF ABCD ACē altitude angle formed angles are equal apothem base bisector bisects chord circum circumference cone COROLLARY cylinder decagon DEFINITION diagonals diameter dihedral angles divided Draw EFGH equal angles equally distant equiangular polygon equilateral triangle equivalent EXERCISE exterior angles Find frustum given circle given line given point hexagon homologous hypotenuse inscribed angle inscribed polygon isosceles triangle lateral area lateral edges Let ABC line joining middle points number of sides opposite sides parallelogram parallelopiped Pass a plane perimeter perpendicular plane MN point of intersection polyhedral angle polyhedron prism prolonged PROPOSITION Prove ABC Prove Proof pyramid quadrilateral radii radius rectangle regular inscribed regular polygon rhombus right angles SCHOLIUM secants segments Show slant height sphere spherical square straight line surface tangent tetrahedron THEOREM trapezoid triangle ABC trihedral unequal vertex volume Whence