## Elements of Geometry and Trigonometry |

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ABCD altitude base Book called centre chord circle circumference coincide common cone consequently construct corresponding Cosine Cotang cylinder denote described diameter difference distance divided draw drawn edges equal Equation EXAMPLES extremity faces feet figure find the area formed Formula four frustum given greater half height hence included inscribed intersection length less logarithm manner mean measured meet middle multiplied opposite parallel parallelogram parallelopipedon pass perpendicular placed plane polyedron polygon principle prism PROBLEM proportional PROPOSITION proved pyramid radii radius rectangle regular result right angles RULE Scholium segment shown sides similar sine solution sphere spherical triangle square straight line Substituting surface taken Tang tangent THEOREM third triangle triangle ABC unit vertex vertices volume whence