A cone of steel has a base radius of 5 cm and a height of 6 cm. It is known that steel weighs 7.8 grams per cubic centimeter. What is the weight of this conical steel?
一个圆锥形的钢材，底面半径是5厘米，高是6厘米．已知每立方厘米的钢材重7.8克，这个圆锥形钢材的重量是多少？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">(1/3) * 3.14 * 25 * 6 * 7.8</gadget>
<output>1_224.6</output>

<result>1_224.6</result>