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# Can someone show me how to work out this problem?

S=2 pie radius² + 2 pie radius height (Surface area of a right circular cylinder); If S=154 pie when radius = 7. find height

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- Manasa SharmaLv 49 years agoFavorite Answer
h=4

solutions is

154 pie=2pieradius2+2pie radiuys*height

take common 2 pie*radius

then you will get

154 pie = 2 pie radius*(radius+height)

cancel the pie on both sides and then substitute the value of radius=7

by simple solving you will get h=4

- 9 years ago
S = 2 pie radius² + 2 pie radius height

S = 2 pie radius(radius + height)

when radius = 7, S = 154 pie

=> 154 pie = 2 pie *7 (7 + height)

=> 14(7 + height) = 154

=> 7+height = 11

=> height = 4

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