If the side of a cylinder is unfolded, it becomes a rectangle. Its length is 9.42cm. What is the area of the bottom of the cylinder in cm**2.
把一个圆柱的侧面展开后是一个长方形，量得它的长是9.42cm，这个圆柱的底面积是多少cm**2．
<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>