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C = 2 \pi r
 100 = 2 \pi r

r =  \frac{100}{2 \pi } 

r= \frac{50}{ \pi y}

A =  \pi r^{2}
A= \pi \frac{50}{ \pi }^2 
A= \frac{10000}{ \pi } 
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please ignore the A hut thing of the final answer! I made a mistake in writing the equation...the final answer is 10000/ pi meters
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