A cylindrical sealed metal container can be used for storing fuel. Its radius is 0.3m and its height is 1.1m. If we have to paint all the surfaces of 50 such containers and each litre of paint can cover an area of 8m^2. how much paint is required?
請一條式過, 唔洗分幾條式
f.2數學(圓柱)10分~
2008-01-22 2:49 am
回答 (3)
2008-01-22 3:53 am
0.3m=30cm
1.1m=110cm
The perimeter of the circle:
30x2x3.14
=188.4cm
The total surface area of the cylinder:
188.4x110
=20724cm
=2072.4m
the total surface area that should be painted:
2072.4x50
=103620m
the paint should be reqired:
103620/(8x2)
=103620/16
=6476.25
=6477
1.1m=110cm
The perimeter of the circle:
30x2x3.14
=188.4cm
The total surface area of the cylinder:
188.4x110
=20724cm
=2072.4m
the total surface area that should be painted:
2072.4x50
=103620m
the paint should be reqired:
103620/(8x2)
=103620/16
=6476.25
=6477
2008-01-22 2:54 am
有冇中文版= =
我睇唔明英文..
因為我英文好虧..
我睇唔明英文..
因為我英文好虧..
收錄日期: 2021-04-26 14:02:05
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