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viktelen [127]
3 years ago
14

What is the circumference of a circle whose area is 100

pi " alt=" \pi " align="absmiddle" class="latex-formula">?
A) 10 B) 20 C) 10\pi D) 20\piE) 25\pi
Mathematics
1 answer:
STatiana [176]3 years ago
5 0
S=100\pi\\\\ \pi r^2=100\pi \ |:\pi\\\\ r^2=100 \\\\ r=\sqrt{100} \ , \ r > 0\\\\ r=10\\\\ C=2\pi r=2\pi \cdot 10=20\pi
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