SOLUTION: A cone has a radius of 12 inches and a surface area of 1050 square inches. What is the slant height of a cone to the nearest tenth of an inch?

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Question 536369: A cone has a radius of 12 inches and a surface area of 1050 square inches. What is the slant height of a cone to the nearest tenth of an inch?
Answer by fcabanski(1391) About Me  (Show Source):
You can put this solution on YOUR website!
Surface area of a cone is SA=pi%2Ars%2Bpi%2Ar%5E2.


Here r=12 and SA=1050. r%5E2=144


1050=pi%2A12%2As%2Bpi%2A144


Subtract the pi%2A144 from both sides.


1050-%283.141592%2A144%29=3.141592%2A12%2As


Divide both sides by the 3.141592(which is pi)*12.


%281050-%283.141592%2A144%29%29%2F%283.141592%2A12%29=s=15.852=15.8

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