The diameter of a circular pool is 8 meters. What is the area of the pool in square meters?
圆形水池直径是8米，这个水池的占地面积是多少平方米？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<result>50.24</result>