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The radius of a circle is 2 inches. When the radius is doubled, by how many square inches is the area increased? Express your answer in terms of $\pi$.

 Apr 6, 2020

Best Answer 

 #1
avatar+34 
+1

\(a=\pi r^2\)

\(a=\pi2^2\)

\(a=4\pi\)

 

\(a=\pi4^2\)

\(a=16\pi\)

 

\(16\pi-4\pi=12\pi\)

 

The difference is \(12\pi\)

 

Hope this helps!!!

-Ako

.
 Apr 6, 2020
edited by Ako180  Apr 6, 2020
 #1
avatar+34 
+1
Best Answer

\(a=\pi r^2\)

\(a=\pi2^2\)

\(a=4\pi\)

 

\(a=\pi4^2\)

\(a=16\pi\)

 

\(16\pi-4\pi=12\pi\)

 

The difference is \(12\pi\)

 

Hope this helps!!!

-Ako

Ako180 Apr 6, 2020
edited by Ako180  Apr 6, 2020
 #2
avatar+392 
+1

yes it does help thank u

Paresh  Apr 6, 2020

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