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If the radius of a circle is 4cm, what is the area?

1 Answer

Daisy L. · Stefan V.

Jun 18, 2018

${50.24 cm}^{2}$ $"50.24 cm"^2$

Explanation:

Using the formula,

$Area = π \times r^{2}$ $"Area" = pi xxr^2$

Here

$π$ $pi$ is a button on your calculator you can find, but is also generally known as $3.14$ $3.14$ , you can use either one, but teachers usually prefer you use the $π$ $pi$ button.
$r =$ $r =$ the radius, in your case, it's $4 cm$ $"4 cm"$

So

$Area = π \times r^{2}$ $"Area" = pi xxr^2$

$= π \times {(4 cm)}^{2}$ $= pi xx ("4 cm")^2$

$= 16pi \ "cm"^2 ~~ "50.24 cm"^2$

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