the corresponding seg-ments of these lines are equal.Thus if the angles at A be equal,AD and AE are equal, and alsoAF, AG. For, folding the figureabout AC, AD falls on AE, be-cause the angles at A are equal,and one semi-circumference onthe other. Hence the points F and G coincide, and alsoD and E,… … BOOK IV. Introduction: Symmetey. 155
Geometry · Geometry, Plane
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