There are 4 cylindrical columns in a hall, the radius of the base of the cylinder is 3 decimeters, and the height is 4.5 meters. Paint the surface of these pillars. If 0.5 kg of paint is used per square meter, how many kg of paint will be used?
某大厅有4根圆柱形柱子，圆柱的底面半径是3分米，高4.5米．在这些柱子的表面涂漆，如果每平方米用漆0.5千克，那么共用漆多少千克？
<gadget id="calculator">3.14 * 0.3 * 2 * 4.5 * 4</gadget>
<output>33.912</output>

<gadget id="calculator">0.5 * 33.912</gadget>
<output>16.956</output>

<result>16.956</result>