There are 4 cylindrical wooden columns in the school corridor. The perimeter of the bottom surface is 9.42 decimeters and the height is 3 meters. If these 4 columns are repainted, how many square decimeters will the painted area be?
学校走廊共有4根圆柱体木柱，底面周长是9.42分米，高3米，重新油漆这4根柱子，油漆面积是多少平方分米．
<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">9.42 * 30 * 4</gadget>
<output>1_130.4</output>

<result>1_130.4</result>