The circumference of the trunk of a pine tree is 94.2 cm. What is the area of the cross-section of the tree in square centimeters?
一棵松树树杆的周长是94.2厘米．这棵树杆的横截面的面积是多少平方厘米？
<gadget id="calculator">94.2 / 3.14 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 ** 2</gadget>
<output>225</output>

<gadget id="calculator">3.14 * 225</gadget>
<output>706.5</output>

<result>706.5</result>