The height of a cylinder is 5 decimeters, and two square sections can be obtained by cutting along the diameter of the bottom surface. What is the circumference of the bottom surface of this cylinder in decimeters?
一个圆柱的高是5分米，沿底面直径剖开可得两个正方形的剖面，这个圆柱的底面周长是多少分米．
<gadget id="calculator">3.14 * 5</gadget>
<output>15.7</output>

<result>15.7</result>