A complete and practical solution book for the common school teacher (1899)
Fairchild, J[ohn] T[heodore] [from old catalog] · Crawfis College, Ohio, The author · leaf 173
37. On a globe 20 ft. in diameter, 30 ft. above a plane, there is a bo\r 4 ft.tall to his eyes: how much surface on the plane is hidden from him? Solution. (1) 30 ft. = EB, the distance the globeis above the plane; 20 ft.—DE,the diameter of the globe; andAD = 4 ft., the distance the boyseye is… … (5) ■BC2 = A35V6 = area of the FIG. 31. surface hidden from the boy. PROBLEM 338. What is the area of the largest square that can be inscribed in asemicircle, the diameter of the circle being- 20 inches? MENSURA TION 159 Solution. (1) Let AB be the diameter of the circle. (2) Draw SB equal and…
Arithmetic · Geometry
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