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philliple481

philliple481

22.04.2020 •

Mathematics

If the area of a circle is 36pi, what is the circumference

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Ответ:

kayla4352

25.01.2022

37.68

Step-by-step explanation:

First off our formulas are:

$Area: A=\pi r^2\\Circumference: C=2\pi r$

Solve for r in the area formula.

$A=\pi r^2\\r^2=\frac{A}{\pi} \\r=\sqrt[]{\frac{A}{\pi} }$

$r=\sqrt[]{\frac{36\pi}{\pi} }$

$r=\sqrt[]{36}$

r=6

Plug this into the circumference formula.

$C=2\pi r\\C=2(3.14)(6)\\C=37.68$

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Ответ:

mollyrosario

06.10.2021

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