The perimeter of the bottom of a cylindrical bucket is 18.84dm, what is the area of the bottom of the bucket?
一个圆柱形水桶的底面周长是18.84dm，这个水桶的底面积是多少？
<gadget id="calculator">18.84 / 3.14 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>