A conical wheat pile for one person has a bottom circumference of 15.7 meters and a height of 1.8 meters. If these wheats are placed in a cylindrical granary, the height of the granary is 1.5 meters. How many square meters is the bottom area?
一人圆锥形麦堆，底面周长是15.7米，高是1.8米，把这些小麦装在一个圆柱形粮仓中正好装满，粮仓的高是1.5米，底面积是多少平方米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">15.7 / 3.14 / 2</gadget>
<output>2.5</output>

<gadget id="calculator">2.5 ** 2</gadget>
<output>6.25</output>

<gadget id="calculator">1.8 / 1.5</gadget>
<output>1.2</output>

<gadget id="calculator">(1/3) * 3.14 * 6.25 * 1.2</gadget>
<output>7.85</output>

<result>7.85</result>