To make 10 round tabletops with a diameter of 2 meters, how many square meters of wooden boards are needed at least? (ignoring consumption part)
做10个直径为2米的圆桌面，至少需要木板多少平方米？(忽略不计消耗部分)
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 10</gadget>
<output>31.4</output>

<result>31.4</result>