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circle circumference

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A circle formed from bending a wire 2016-10-16
From Deszaree:
The same piece of a wire is bent to form a circle
calculate:
a, the radius of the circle
b, the area of the circle

Answered by Penny Nom.
The area of a circle in terms of the circumference 2014-11-04
From Sarah:
How do you find the area of a circle if you already have the circumference? There was one answer to this question already but it didn't make sense to me, because they rounded up pi which you can't do so the answer is incorrect. thanks
Answered by Penny Nom.
A reel of cotton thread 2012-06-05
From Grace:
91 meters of cotton goes round the cotton reel. About how many times does the cotton go round the reel?
Give your answer to the nearest ten.
(The Diameter of the cylinder is 3cm)

Answered by Penny Nom.
 
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