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How do you find the area of a circle when they only give you the radius or the diameter?

on my homework they asked me to find the area of the circle given only the radius or the diameter. can someone give me both formulas

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Pi r squared - 3.14 x radius (middle of circle to the end) and square all that.

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So the area of a circle with the radius 13.9 would be 606.6794?
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Actually, you only square the radius, then you multiply by 3.14 (The radius is 1/2 of the diameter.)
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Pi "r" squared. Take half the diameter to get radius... multiply it by itself, and then by 3:14

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3.14(R squared)

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This one is right. (clicked "like")
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Haha ok
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By (pi)r^2 you square the radius then multiply it by pi, approximately 3.14 or 22/7.

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A=(pi)r^2
If you are only given diameter, divide it by 2 to get radius.

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So the area to a circle with the radius 13.9 would be 606.6794?
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2 pi r Did you know that pi day was yesterday? 3.14 March 14th

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Yeah! I love pie! I they're good
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everyone thinks that but it's "pi" day it's the equation! ;)
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C=pi?d^2