The school plans to paint the outside of the columns in the corridor. After measuring the diameter of each column is 0.4 meters and the height is 4 meters, what is the total area that needs to be painted for the 6 columns?
学校计划给通廊的圆柱外面涂上油漆，经测量每根圆柱的直径0.4米，高4米，6根圆柱共需要涂漆的面积是多少．
<gadget id="calculator">3.14 * 0.4 * 4 * 6</gadget>
<output>30.144</output>

<result>30.144</result>