## Elements of Geometry ... By J. Playfair ... With additions, by W. Wallace ... Ninth edition, with additions, by J. Davidson |

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ABC is equal ABCD altitude angle ABC angle ACB angle BAC angle equal arch AC base BC bisect Book centre circle ABC circumference coincide cosine cylinder deﬁnition demonstrated described diameter divided draw equal angles equiangular equilateral equilateral polygon equimultiples Euclid exterior angle ﬁnd ﬁrst fore given straight line greater hypotenuse inscribed join less Let ABC magnitudes meet opposite angle parallel parallelepipeds parallelogram perpendicular plane polygon prism produced proportional proposition Q. E. D. PROP quadrant radius ratio rectangle contained rectilineal ﬁgure remaining angle segments semicircle shewn side BC sine solid angle solid parallelepipeds spherical angle spherical triangle square straight line BC straight line drawn superﬁcies tangent THEOR third touches the circle triangle ABC triangle DEF wherefore