A cylindrical aluminum alloy material is 2.5 meters long, and the radius of the cross section is 2 cm. It is known that the aluminum alloy material weighs 3 grams per cubic centimeter. How many kilograms does this aluminum alloy material weigh?
一段圆柱形铝合金材料长2.5米，横截面的半径是2厘米，已知每立方厘米的铝合金材料重3克，这段铝合金材料重多少千克？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3 / 1_000</gadget>
<output>3/1_000 = around 0.003</output>

<gadget id="calculator">3.14 * 4 * 2.5 * 100 * (3/1_000)</gadget>
<output>9.42</output>

<result>9.42</result>