Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 91
80 PLAXE GEOMETRY Proposition XXYIII. Theorem 215. An exterior angle of a triangle is equal to the sumoftlve two remote interior angles, B … C D Given A ABC with Adcb an exterior Z. To prove ZDCB = Z.A + Zb. The proof is left as an exercise for the student. Hint. Draw CE II AB. Ex. 239. The bisector of an exterior angle at the vertex of anisosceles triangle is parallel to the base. Ex. 240. If the sum of two exterior angles of a…
Geometry, Plane · Geometry, Solid
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