The circumference of the base of a cylinder is 1.256 meters, what is the area of its base?
圆柱体的底面周长是1.256米，它的底面积是多少．
<gadget id="calculator">1.256 / 3.14 / 2</gadget>
<output>0.2</output>

<gadget id="calculator">0.2 ** 2</gadget>
<output>0.04</output>

<gadget id="calculator">3.14 * 0.04</gadget>
<output>0.1256</output>

<result>0.1256</result>