Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 23
side CD common, and the included angle.4 CD equal to the included angle DCB: hence the two thangles are equal (Th. iv); and hence,the angle A is equal tothe angle B. Cor. 1. Hence, the line which bisects the vertical angle oian isosceles triangle, bisects the base. It is also perpendicu-lar to the… … THEOREM VII. Conversely.—If a triangle has two of its angles equal, ifusides opposite those angles will also be equal In the triangle ABC, let the angle A befiqual to the angle B: tnen will the sideBC be equal to the side AC. For, if the two sides are not equal, oneof them must be greater than the…
Geometry · Plane trigonometry
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