Question

Please Help !! What is the surface area of a cylinder with base radius 4 and height 5. Show your work .

Answer 1

251.333 (Repeating)

Explanation:

First, you need to find the area of the circle at the top, which is
`\pi r^(2)`

Next, you multiply it by the height. (I did also use actual pi)

This is if it's total area, not lateral.

Answer 2

226.19

Explanation:

A= 2πrh+ 2πr2= 2·π·4·5+2·π·42≈226.19467

or

S = (2 * pi * r^2) + (2 * pi * r * h)

S = (2 * pi * 4^2) + (2 * pi * 4 * 5)

S = (32 pi) + (40 pi) = 72pi = 226.08 ANS.