The side area of a cylinder is 12.56 square decimeters, and its height is 2 decimeters. What is the circumference of its base?
一个圆柱侧面积是12.56平方分米，高是2分米，它的底面周长是多少分米．
<gadget id="calculator">12.56 / 2</gadget>
<output>6.28</output>

<result>6.28</result>