A circle is surrounded by a wire with a length of 251.2 cm. What is the area of the circle in square centimeters?
用一根长251.2厘米的铁丝围成一个圆，这个圆的面积是多少平方厘米．
<gadget id="calculator">251.2 / 3.14 / 2</gadget>
<output>40</output>

<gadget id="calculator">40 ** 2</gadget>
<output>1_600</output>

<gadget id="calculator">3.14 * 1_600</gadget>
<output>5_024</output>

<result>5_024</result>