A semicircular part has a perimeter of 51.4 cm, what is its area in square centimeters? (π is calculated with 3.14)
一个半圆形零件，周长是51.4厘米，它的面积是多少平方厘米？(π用3.14计算)
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">3.14 * 50</gadget>
<output>157</output>

<result>157</result>