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What is the area of a circle with a circumference of 14π inches?

admin2011-03-08  23
问题 What is the area of a circle with a circumference of 14π inches?
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答案 The equation for the area of a circle is A=πr2. The equation for the circumference of a circle is C=2πr. Since you are given the circumference, you can use that to find the radius, r, and then use the radius to find the area: 14π=2πr 14=2r r=7 Now substitute r into the equation for area: Area=π(72) Area=49π
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