There are four identical columns in a building. It is known that the circumference of the base of the column is 15.7dm and the height is 10m. If the sides of the columns are to be covered with colored cloth, how many square decimeters of colored cloth are needed at least?
一座大厦有四根同样的圆柱，已知圆柱的底面周长是15.7dm，高10m，如果要把圆柱的侧面都包裹上彩布，至少需彩布多少平方分米？
<gadget id="calculator">15.7 * 10 * 10 * 4</gadget>
<output>6_280</output>

<result>6_280</result>