## Elements of Geometry: Containing the First Six Books of Euclid, with a Supplement on the Quadrature of the Circle, and the Geometry of Solids; to which are Added, Elements of Plane and Spherical Trigonometry |

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ABC is equal ABCD adjacent angles altitude angle ABC angle ACB angle BAC angles equal base BC bisected centre chord circle ABC circumference common section cosine cylinder deﬁnition demonstrated diameter divided equal and similar equal angles equiangular equilateral equilateral polygon equimultiples Euclid exterior angle ﬁnd ﬁrst fore four right angles given straight line greater Hence hypotenuse inscribed join less Let ABC Let the straight magnitudes meet multiple opposite angle parallel parallelogram parallelopipeds perpendicular polygon prism PROP proportional proposition quadrilateral radius ratio rectangle contained rectilineal ﬁgure remaining angle SCHOLIUM segment semicircle shewn side AC sine solid angle spherical angle spherical triangle square straight line BC superﬁcies THEOR third touches the circle trian triangle ABC wherefore