International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 294
J482 GEOMETRY AND TRIGONOMETRY. Example.—What is the exact area in square inches of Fig. 911SoiATioN.—Divide the figure into rectangles, triangles, and parts ofa circle, as shown by the dotted lines, then the total area equals 8-inchcircle — 4-inch circle — segment A /i + rectangle AUG F+ 2 times… … Fig. 91. The chord A B = Z inches, and the radius of the circle = 4 inches; 1 5hence, the sine of one-half the angle at center = -j- = .375, and one-half the angle at center = 22 1 27 , or angle at center = 44° 2 54 = 44.05°. 44 05Area of sector = 50.27 X ^^ = 6.15 a . The altitude of the triangle…
Railroad engineering
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