joelalexjohn joelalexjohn

01-01-2018
Mathematics

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what is the total surface area of a cylinder whose length is twice the radius

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tynollette tynollette

01-01-2018

lateral surface area of a cylinder: 2πrh, r is the radius, h is the height.
area of the top and bottom circle: πr²
when h=2r, the total surface area is:
2πr(2r)+πr²+πr²=6πr²
the answer is 6πr²

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