Mom buys an aluminum pot of 18 cm (that is, the diameter of the bottom surface is 18 cm) and puts it on the stove. How many square centimeters does the bottom of the pot occupy on the stove?
妈妈买一个18公分(即底面直径是18厘米)的铝锅，把它放在灶台上，锅底占灶台多少平方厘米．
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">9 ** 2</gadget>
<output>81</output>

<gadget id="calculator">3.14 * 81</gadget>
<output>254.34</output>

<result>254.34</result>