The diameter of the base of a cylinder is 4 decimeters. If its sides are a square, what is the height of the cylinder?
一个圆柱的底面直径是4分米，如果它的侧面展开是一个正方形，那么圆柱的高是多少分米
<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<result>12.56</result>