If the area of a circle in square feet equals its radius in feet, then the circle's radius, in feet, is closest to
A) 0.25
B) 0.32
C) 0.45
D) 0.5
E) 0.65
Answer: B
Source: Economist
If the area of a circle in square feet equals its radius in feet, then the circle's radius, in feet, is closest to
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Solution:
Let’s let r = the radius of the circle, in feet, and we can create the equation:
πr^2 = r
Dividing both sides by r (since r can’t be 0), we have:
πr = 1
r = 1/π ≈ 0.32
Answer: B
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