The area of a circle is 49Π square inches. Find the radius of a circle.
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The area of a circle is 49Π square inches. Find the radius of a circle.

[From: ] [author: ] [Date: 13-03-13] [Hit: ]
unless the circle is theoretical, and lies on a plane where you need cooradinate values,......
Please help me! I'm studying for a test and I'm stuck on this question. Can you explain how to get the answer and what the answer is. Thanks xx

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We know that the formula for finding area of a circle is pi(r^2)
That being so,
pi(r^2) = 49pi Eliminate pi on both sides
r^2 = 49
r = 7 or -7, unless the circle is theoretical, and lies on a plane where you need cooradinate values, then -7 is impossible (you can't have a negative length/radius)
Therefore radius = 7 inches

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r = sqrt(49) = 7 in
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