There are four cylindrical columns with a height of 4.5 meters and a diameter of 0.8 meters in the front hall of the school. Now they need to be repainted. Calculated that 1 kilogram of paint can paint 5 square meters, how many kilograms of paint will be used?
学校门前厅有四根高4.5米，底面直径0.8米的圆柱形柱子，现在要重新油漆，按1千克油漆可漆5平方米计算，要用多少千克油漆？
<gadget id="calculator">3.14 * 0.8 * 4.5 * 4</gadget>
<output>45.216</output>

<gadget id="calculator">45.216 / 5</gadget>
<output>9.0432</output>

<result>9.0432</result>