A cylinder with a height of 12.56 cm is a square, what is the radius of its base in cm?
一个高12.56cm的圆柱体，侧面展开是正方形，它的底面半径是多少cm．
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

<result>2</result>