The height of a cone is 12 decimeters and its volume is 80 cubic decimeters. What is the area of its base?
一个圆锥的高是12分米，体积是80立方分米，它的底面积是多少．
<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">80 * (1/4)</gadget>
<output>20</output>

<result>20</result>