A cylinder has a lateral area of 6.28 square decimeters and a height of 1 decimeter. What is the area of the base of a cone of equal volume and height?
一个圆柱的侧面积是6.28平方分米，高是1分米．和它等体积等高的圆锥的底面积是多少．
<gadget id="calculator">6.28 / 1 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">3.14 * 1 * 1 * 3</gadget>
<output>9.42</output>

<result>9.42</result>