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# help

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The radius of a circle is increased by 100%. By what percent is the area of the circle increased?

Nov 3, 2019

#1
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$$\pi{r^2}=A$$

Lets just say that the radius is 1

So the area would be pi.

If the radius is increased 100%, then the new radius is 2.

Susbtituting 2 into the equation, the new area would be 4pi.

$$\frac{4\pi}{\pi}=4$$

Based on this, can you figure out the answer?

Nov 3, 2019