A cylinder has a lateral area of 12.56 square meters and a height of 4 meters. What is the area of its base in square meters?
一个圆柱的侧面积是12.56平方米，高是4米，它的底面积是多少平方米？
<gadget id="calculator">12.56 / 4</gadget>
<output>3.14</output>

<gadget id="calculator">3.14 / 3.14 / 2</gadget>
<output>0.5</output>

<gadget id="calculator">0.5 ** 2</gadget>
<output>0.25</output>

<gadget id="calculator">3.14 * 0.25</gadget>
<output>0.785</output>

<result>0.785</result>