Babbit, Arthur B · New York, H. Holt and company · leaf 178
TIONS 167 lines in Fig. 61 are perpendicular, which is equallytrue of the two hues shown in Fig. 63.) ANGLES The opening beiween two straight Hues whichmeet is called an angle. The lines M R and M N,Fig. 64, form an angle.The lines are called thesides of the angle, andthe point of meeting isknown… … Fig. 64 straight angle. Lines A drawn in opposite di- ^^^- ^^ rections from the point A A, Fig. 65, form a straight angle. A right angle is formed when the sides are per- ^ 3 C pendicular. The angles ^ \g. 66 A B C and A B D, Fig. ^^^ 66, are right angles. Every angle less than ^^,^ ^ \ a right…
Mechanical drawing
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