conical iron block has a base radius of 3 cm and a height of 5 cm. If the weight of iron per cubic centimeter is 7.8 grams, how much does the iron block weigh in grams?
一个圆锥形铁块，底面半径3厘米，高5厘米，如果每立方厘米铁重7.8克，这个铁块重多少克？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">(1/3) * 3.14 * 9 * 5 * 7.8</gadget>
<output>367.38</output>

<result>367.38</result>