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 $\pi$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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 $\pi$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
12\pi
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 $\pi$.
train