A cylindrical bucket is 6 decimeters high, and the iron hoop at the bottom of the bucket is about 15.7 decimeters long. How many square decimeters of wood should be used to make such a bucket?
一个圆柱形的水桶，高6分米，水桶底部的铁箍大约长15.7分米，做一个这样的水桶至少用木板多少平方分米？
<gadget id="calculator">15.7 * 6</gadget>
<output>94.2</output>

<gadget id="calculator">15.7 / 3.14 / 2</gadget>
<output>2.5</output>

<gadget id="calculator">2.5 ** 2</gadget>
<output>6.25</output>

<gadget id="calculator">3.14 * 6.25</gadget>
<output>19.625</output>

<gadget id="calculator">94.2 + 19.625</gadget>
<output>113.825</output>

<result>113.825</result>