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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
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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

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