For a cone and a cylinder with equal base and equal volume, if the base of the cylinder is 4 square centimeters, how many square centimeters is the base of the cone?
等底等体积的圆锥与圆柱体，已知圆柱底为4平方厘米，圆锥底为多少平方厘米．
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>