Dig a cylindrical oil pool with a depth of 2 meters and a bottom radius of 1 meter in the ground. What is the area of the oil pool in square meters?
在地面挖一个深2米，底面半径1米的圆柱形油池，这个油池的占地面积是多少平方米．
<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<result>3.14</result>