Planning & EstimatingCâu 582 / 700
A round drilled pier is 24 inches in diameter and 18 ft deep. Using pi = 3.1416, what is the APPROXIMATE volume of concrete required to fill it?
a.8.4 cubic yards
b.2.1 cubic yards
c.56.5 cubic yards
d.1.05 cubic yards
Giải thích
A 24-inch diameter is a 12-inch (1 ft) radius. Volume = pi x r^2 x h = 3.1416 x 1^2 x 18 = 56.55 cubic feet. Divide by 27: 56.55 / 27 = 2.09, about 2.1 cubic yards (b). Option (a) wrongly uses the diameter (2 ft) as the radius. Option (c) forgets to divide by 27. Option (d) uses only half the depth.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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