底面半径=12.56÷3.14÷2=2分米
底面积=3.14×2²=12.56平方分米
高=2×2×3=12分米
侧面积=12.56×12=150.72平方分米
表面积=150.72+12.56×2=175.84平方分米
一个圆柱底面周长是12.56dm,高是直径的3倍,求它的表面积
一个圆柱底面周长是12.56dm,高是直径的3倍,求它的表面积
要脱式计算【一步托下来】
要脱式计算【一步托下来】
数学人气：593 ℃时间：2019-10-11 16:40:17
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