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

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Jun 19, 2018

#### Answer:

${\text{50.24 cm}}^{2}$

#### Explanation:

Using the formula,

$\text{Area} = \pi \times {r}^{2}$

Here

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

So

$\text{Area} = \pi \times {r}^{2}$

$= \pi \times {\left(\text{4 cm}\right)}^{2}$

$= 16 \pi \setminus {\text{cm"^2 ~~ "50.24 cm}}^{2}$

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