International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 251
691. If two angles have their sidesparallel and lie in the same or in oppo-site directions, they are equal. Thus,if the side A B, Fig. 20, is parallel tothe side D E, and if the side B C isparallel to the side E E, then the angleE = the angle B. Fig. 20. … 692. If two sides of anangle are perpendicular totwo sides of another angle,the two angles are equal.Thus, ii DE and G Ef, Fig.21, are perpendicular toB A, and E E and Ef K areperpendicular to B C, thenwill angle E = angle B =■angle //. EXAMPLES FOR PRACTICE. 1. In a pulley with five arms, what…
Railroad engineering
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