Planning & Estimating第 71 / 100 题
To find the area of a circular planting bed with a 20-foot diameter, which calculation is correct?
a.20 x 20
b.3.14 x 20
c.2 x 3.14 x 10
d.3.14 x 10 x 10 (about 314 square feet)
解析
Circle area equals pi times the radius squared, and the radius is half the diameter, so 10 feet. Thus 3.14 x 10 x 10 equals about 314 square feet. Using diameter instead of radius is a common estimating error.
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