SOLUTION: What is the ratio of the surface area of the larger cylinder which has a diameter of 12cm. and a height of 6cm. to a smaller cylinder which has a diameter of 8cm and a height of 4c

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Question 399482: What is the ratio of the surface area of the larger cylinder which has a diameter of 12cm. and a height of 6cm. to a smaller cylinder which has a diameter of 8cm and a height of 4cm. the book answer is 9:4 my answer is 2:1
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

 r = 6cm, h = 6cm  and r = 4cm, h = 4cm

surface area = 2pi%2Ar%5E2+%2B+2pi%2Ar%2Ah+

         2pi%2836+%2B+36%29%2F2pi%2816+%2B+16%29+=+72%2F32+=+9%2F4  OR 9:4