Elements of Geometry and Trigonometry: From the Works of A. M. Legendre

ABCD altitude apothem Applying logarithms centre chord circle circumference complement cone consequently convex surface cosec cosine Cotang cylinder demonstrated in Book denote diameter distance divided draw equal Equation EXAMPLES feet find the area Find the logarithmic following RULE frustum given angle greater half sum hence hypothenuse included angle inscribed intersection less Let ABC log cot log sin lower base mantissa multiplied number corresponding number of sides opposite parallel parallelogram parallelopipedon perpendicular plane MN polar triangle polyedral angle polyedron principle demonstrated prism proportional PROPOSITION proved pyramid quadrant radii radius rectangle regular polygon right angles right-angled triangle Scholium segment similar six right slant height solution sphere spherical angle spherical excess spherical polygon spherical triangle square straight line subtracting Tang tangent THEOREM triangle ABC triangular prism upper base vertex whence write the following