Babbit, Arthur B · New York, H. Holt and company · leaf 180
Fig. 70 1/1/ Y Fig. 71 supplement of the other. W X Z, Fig. 71, are supplementary. TRIANGLES A triangle is a plane surface bounded by threestraight lines. The bounding hues are called thesides of the triangle, the angles formed by the sides GEOMETRICAL DEFINITIONS 169 … Fig. 72 are called the angles of the triangle and the verticesof these angles are the vertices of the triangle. Thebase of a triangle is theside upon which it is sup-posed to stand. Theangle opposite the baseis known as the verticalangle, and the vertex ofthis angle is called thevertex of the…
Mechanical drawing
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