A cylindrical grain hoard full of wheat has a bottom area of 4.5 square meters and a height of 1.8 meters. If these wheats are piled up into a conical wheat pile with a height of 1.2 meters, how many square meters does the conical wheat field cover?
一个装满小麦的圆柱型粮囤，底面积是4.5平方米，高是1.8米，如果把这些小麦堆成高是1.2米的圆锥形麦堆，圆锥形麦地占地面积是多少平方米？
<gadget id="calculator">3 / 1.2</gadget>
<output>2.5</output>

<gadget id="calculator">8.1 * 2.5</gadget>
<output>20.25</output>

<result>20.25</result>