Babbit, Arthur B · New York, H. Holt and company · leaf 180
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… … Fig. 73 Triangles classified by sides An equilateral triangle is one having all of itsequal in length. SeeFig. 74. This triangleis frequently called equi-angular, as all of itsangles are also equal. An isosceles triangle isone having two of itssides equal. See Fig. 75.Two of the angles of…
Mechanical drawing
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