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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  • 9 years ago
    Favorite 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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