The side view of a cylinder is a square. The side length of this square is 12.56cm. What is the volume of this cylinder?
一个圆柱体的侧面展开图是个正方形，这个正方形的边长是12.56cm，这个圆柱体的体积是多少．
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 12.56</gadget>
<output>157.7536</output>

<result>157.7536</result>