共需油漆多少千克
- 时间:2020-05-27 19:06:25
- 分类:数学世界
- 阅读:119 次
省艺术宫里面有8根圆柱,每根柱子的底面半径是0.35m,高是30m。先要给这些柱子涂上油漆,如果每平方米用油漆0.25kg,共需油漆多少千克?
数学题解答:需用油漆多少千克和柱子涂油漆的面积有关。柱子上顶天,下立地,所以只有侧面能被涂上颜色。只需算出一根柱子的侧面积,再乘上8,就知道了所有柱子涂油漆的面积,进而可以求出油漆的重量。
侧面积:3.14×0.35×2×30=65.94(平方厘米)
涂油漆总面积:65.94×8=527.52(平方厘米)
油漆重量:527.52×0.25=131.88(kg)
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