Question

The area of a circle with radius r is given by the formula A = (pi)r^2. If a circle has area 4(pi) square inches, what is the radius?​

Answer 1

`\displaystyle 2\:in.`

Explanation:

`\displaystyle {\pi}r^2 = A \\ \\ \frac{{\pi}r^2}{\pi} = (4\pi)/(\pi) \hookrightarrow √(4) = √(r^2) \\ \\ \boxed{2 = r}`

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