Elements of Geometry

ABCD adjacent angles angles are equal apothem base and altitude bisector bisects centre chord circumference circumscribed coincide cone of revolution conical surface construct Def.-The Defs.-A diagonals diameter diedral angles distance divided draw equivalent Exercise.-The exterior angle figure frustum given line given point given straight line GIVEN TO PROVE Hence Hint.-Apply homologous homologous sides hypotenuse included angle intersection isosceles triangle lateral area lateral edges lateral faces locus middle point number of sides parallel planes parallelogram parallelopiped perimeter perpendicular plane MN polyedral angles polyedron prismatic surface PROPOSITION XI Q. E. D. PROPOSITION quadrilateral radii radius ratio of similitude rectangle regular inscribed regular polygon respectively equal right angles right section right triangle segment similar slant height sphere spherical polygon spherical triangle surface symmetrical tangent THEOREM triangle ABC triangles are equal triangular prism triedral vertex vertices volume