Question

The volume of a cylinder closed at the one end is 1056cm cube. If its height is 21cm, and the radius is 4, find the total surface area

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Answer 1

578 cm^2

Explanation:

The surface area is given by one circle of radius 4 (the other is missing!), plus a "rectangle" (the lateral surface) of sides 21 and
`2\pi * 4` (the length of the circumference at the base). Adding them up we get:
`\pi *4^2 + 21* 2\pi*4 = 184\pi \approx 578 cm^2`