SOLUTION: Please help me solve this.The outside of a cylindrical structure at a factory must be painted.it radius is 3,5 m and its height is 8 m.How many litres of paint must be bought if 1

Question 986902: Please help me solve this.The outside of a cylindrical structure at a factory must be painted.it radius is 3,5 m and its height is 8 m.How many litres of paint must be bought if 1 litre covers 10 m(2)?(the bottom of the structure will not be painted.)
Answer by Cromlix(4381) (Show Source): You can put this solution on YOUR website!
Hi there,
I assume the top of the cylinder will be painted
but, not the bottom.
Surface area of a cylinder
= pi* r^2 + 2* pi *r *h
= pi* 3.5^2 + 2 *pi *3.5* 8 (* times)
= 38.49 + 175.93
- 214.42 m^2
No. of litres required:
= 214.42/10
= 21.4 litres.
Hope this helps :-)
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