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New plane and spherical trigonometry, surveying, and navigation (1903)
Wentworth, G. A. (George Albert), 1835-1906 · Boston : Ginn & Company · leaf 128
zontal plane.B = 90°.A = 60°..-. C = 30°. 5. If the suns altitude is 30°, findthe length of the longest shadow caston a horizontal plane by a stick 10feet in length. Let a be a stick J_ to rays of sun,and c be the longest shadow. - = sin A = l.c c = 2 a = 20. Therefore, the longest shadow is 20… … sin i BOC = f. log 2 = 0.30103colog 3 = 9.52288 - 10log sin ii?OC = 9.82391 i BOC = 41° 48/ 38. BOC = 83° 37/ 16. area O = it x 32. logTr = 0.49715 log 32 = 0.95424 log area O = 1.45139 area© = 28.274.Area of sector BOC83° 37 16 360° x 28.27 4 _ 301036 1296000 x 28.274 = 7525° x 28.274.324000 log…Trigonometry · Surveying · Navigation
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