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what is the circumference of a circle whose area is 100[tex] \pi [/tex]?
A) 10 B) 20 C) 10[tex] \pi [/tex] D) 20[tex] \pi [/tex]E) 25[tex] \pi [/tex]

Respuesta :

mjankiewicz
[tex]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[/tex]

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