Question

How do I find the surface area of a right cylinder?
The diameter is 8.4in and it is 8in. high?

Answer 1

The surface area is two parts.
1) First, find the surface area of the two circles on each end, with area of circle = pi x radius squared = pi x (diameter/2) squared = pi (4.2)(4.2)
2) Then imagine unwrapping the cylinder so that you see the side unwrapped, like a paper towel tube unwrapped. The shape is a rectangle that is as tall as the cylinder (8 in) and as wide as the circumference of the circle that it was wrapped in. Circumference is 2 x PI x Radius = Pi x diameter = 8.4 x PI.
3) Be sure to add the areas of both circle "ends" to the area of the rectangle "sides' to get the whole surface area.

Answer 2

Thankyou!

Answer 3

Your welcome... glad to help.