Question

Find the radius of the right cylinder shown, in which the height of the cylinder is equal to its diameter (picture will be provided).

Answer 1

so you are told the surface area...

use the formula

\[SA = 2\pi r^2 + 2\pi r h\]

using the information you have been given

\[150\pi = 2 \pi r^2 + 2 \pi r \times 2r\]

which simplifies to

\[150\pi = 6 \pi r^2\]

now solve for r

Answer 2

Thank you very much!

Answer 3

Would R=25in?

Answer 4

r^2 = 25

so then find r