In front of the exhibition hall, there are four cylindrical columns with a height of 3.5 meters, and the circumference of each column is 1.8 meters. Now paint these pillars, if 0.5 kg of paint is used per square meter, how many kg of paint will be used in total?
展览大厅前有4根高3.5米的圆柱形的立柱，每根立柱的底面周长是1.8米．现在要给这些立柱涂上油漆，如果每平方米用油漆0.5千克，一共要用油漆多少千克？
<gadget id="calculator">1.8 * 3.5 * 4</gadget>
<output>25.2</output>

<gadget id="calculator">0.5 * 25.2</gadget>
<output>12.6</output>

<result>12.6</result>