A Treatise on Special Or Elementary Geometry

ABCD adjacent adjacent angles altitude angles equal apothem axis base and altitude bisect centre chord circle whose radius circumference coincide conceive cone cylinder DEM.-In DEM.-Let diagonals diameter dicular diedral distance dividers draw drawn edge equal angles equally distant equilateral equivalent exterior angle facial angles fall figure frustum Geometry given line given point greater Hence homologous sides inches included angle inscribed inscribed angle intersect isosceles lune measured number of sides oblique lines opposite parallel parallelogram parallelopiped passing pendicular perpen perpendicular plane MN prism Prob Prob.-To produced PROP pyramid Q. E. D. PROPOSITION quadrilateral radii rectangle regular polygon revolve right angled triangle S-ABC secant secant line similar slant height sphere spherical angle spherical triangle square straight line take the direction tangent Theorem.-The area triangle ABC triedral vertex vertices whence