A cone part weighs 306.15 grams. The height of this part is 6 cm. If steel weighs 7.8 grams per cubic centimeter, what is the area of the bottom of this part?
一个圆锥体零件重306.15克，这个零件的高是6厘米，如果每立方厘米钢重7.8克，这个零件的底面积是多少？
<gadget id="calculator">306.15 / 7.8</gadget>
<output>39.25</output>

<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">39.25 * (1/2)</gadget>
<output>19.625</output>

<result>19.625</result>