Elements of Geometry

allel altitude angles are equal angles formed apothem arms Article axis bisect chord circle circum circumference circumscribed coincide common measure cone Corollaries.-I Corollary corresponding curvature of half curved surface demonstrated diagonals diameter diedral direction distance divided equal angles equally distant equivalent Euclid Exercises.-1 extent faces four right angles frustum Geometry given line given point given straight line greater homologous lines hypotenuse inscribed inscribed angle intersection isosceles triangle length less line joining line parallel locus magnitude medials midpoint number of sides opposite sides parallel lines parallelogram parallelopiped perimeter perpendicular plane figures polyedral polyedron prism proportional quadrilateral radii radius ratio rectangle regular polygon respectively equal right-angled triangle secant segments similar slant height sphere spherical angle spherical excess square subtended supplementary symmetrical tangent tetraedrons theorem Theorem.-The tion triangle ABC triedral variable vertex vertices volume