A cylinder of steel is 80 cm long and has a base radius of 5 cm. If each cubic centimeter of steel weighs 7.8 grams, how much does this piece of steel weigh?
一段圆柱体钢材，长为80厘米，底面半径为5厘米．如果每立方厘米的钢材重为7.8克，这段钢材有多重？
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 80</gadget>
<output>6_280</output>

<gadget id="calculator">6_280 * 7.8</gadget>
<output>48_984</output>

<result>48_984</result>