A cylinder of steel has a base diameter of 6 cm and a height of 15 cm. If steel weighs 7.8 grams per cubic centimeter, how many grams does this cylindrical piece of steel weigh?
一根圆柱形钢材，量得它的底面直径是6厘米，高15厘米．如果每立方厘米钢重7.8克，现在这根圆柱形钢材重多少克？
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

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

<gadget id="calculator">3.14 * 9 * 15 * 7.8</gadget>
<output>3_306.42</output>

<result>3_306.42</result>