Question

what are the following formulas?

Answer 1

B

Answer 2

Why? Why is it B?

Answer 3

The side is like the label of the can. If you peel it off and lay it flat it will be a rectangle. The area of a rectangle is the product of the two sides. One side is the height of the can, the other side is the perimeter of the circle, since the label wraps once around the can. So the area of the rectangle is (2 pi r)* h.

Answer 4

the thing is that in lateral area you are excluding any bases, so basically it is looking for a portion of the right cylinder.