Plane Geometry

AABC ABCD acute angle adjoining figure altitude base bisect bisectors called central angle chord circular cone circumference circumscribed congruent construct Corollary corresponding cube cylinder diagonal diameter dihedral angles distance divide Draw drawn equiangular equilateral triangle EXERCISES feet frustum geometry given line given point Hence HINT hypotenuse inscribed interior angles intersection isosceles triangle lateral area lateral edges length locus lune measured middle point number of sides opposite Outline of proof parallel lines parallelepiped parallelogram perimeter perpendicular polyhedral angle polyhedron prism proportional prove pyramid quadrilateral radii radius ratio rectangle regular polygon regular polyhedrons rhombus right angles right circular right triangle ruler and compasses secant segment Show similar skew lines slant height solid sphere spherical polygon spherical triangle square straight line subtended surface tangent tetrahedron Theorem trapezoid triangle ABC triangular trihedral vertex vertices volume