Babbit, Arthur B · New York, H. Holt and company · leaf 179
traight angle,the angle formed iscalled an obtuse angle.See Fig. 68. An angle greater thana straight angle and lessthan two straight anglesis called a reflex angle.Fig. 69 represents a re-flex angle. Two angles are com-plementary when theirsum is equal to a rightangle. Each is calledthe complement… … 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
Mechanical drawing
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