There are 10 circular pillars in the corridor of the school. The radius of each pillar is 4dm and the height is 25dm. To paint these pillars, 0.3kg of paint is used per square meter. How many kilograms of paint are needed in total?
学校走廊上有10根圆形柱子，每根柱子底面半径是4dm，高是25dm，要油漆这些柱子，每平方米用油漆0.3kg，共需要油漆多少千克？
<gadget id="calculator">2 * 3.14 * 0.4 * 2.5 * 10</gadget>
<output>62.8</output>

<gadget id="calculator">0.3 * 62.8</gadget>
<output>18.84</output>

<result>18.84</result>