The child saw in the extracurricular book: there is a giant sequoia in North America, the circumference of the trunk root is 37.68m, the clever child immediately calculated the cross-sectional area of the giant sequoia. Can you figure it out (the cross-section of Sequoia is approximately circular)?
小童在课外书上看到：北美洲有一种巨杉，树干根部周长达37.68m，聪明的小童马上算出了这棵巨杉的横截面面积．你能算出来吗(巨杉的横截面近似于圆形)？
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">37.68 / 6.28</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">3.14 * 36</gadget>
<output>113.04</output>

<result>113.04</result>