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What is the circumference of a circle whose area is 100
\pi?

A) 10 B) 20 C) 10
\pi D) 20
\piE) 25
\pi

User Minn
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S=100\pi\\\\ \pi r^2=100\pi \ |:\pi\\\\ r^2=100 \\\\ r=√(100) \ , \ r > 0\\\\ r=10\\\\ C=2\pi r=2\pi \cdot 10=20\pi
User Vicusbass
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