A conical object has a base radius of 2 cm and a height of 5 cm. A block of iron weighs 7.8 grams per cubic centimeter, how many grams does this part weigh?
一个圆锥形零件，底面半径2厘米，高5厘米．每立方厘米铁块重7.8克，这个零件重多少克？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">(1/3) * 3.14 * 4 * 5 * 7.8</gadget>
<output>163.28</output>

<result>163.28</result>