Expand a cylinder sideways, measure the length of the unfolded rectangle is 9.42 cm, what is the area of the bottom of the cylinder.
把一个圆柱体侧面展开，量得展开后的长方形的长是9.42厘米，这个圆柱体的底面积是多少．
<gadget id="calculator">9.42 / 3.14 / 2</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 ** 2</gadget>
<output>2.25</output>

<gadget id="calculator">3.14 * 2.25</gadget>
<output>7.065</output>

<result>7.065</result>