Question

Please help I have no clue how to do this

Answer 1

176 (Pi)

Explanation:

The formula is given to you. Just plug in the values. You need the radius, r, which is 4. (You are given the diameter of 8 cm, so the radius is always just half of the diameter.)

Surface area= 2 X pi X (radius squared, which is 4 squared, or 16.) + 2 X pi X radius (which is 4) X height (which is 18 cm)

2 X pi X 16 + 2 X pi X 4 X 18

32(pi) + 144 (pi)

176 (pi)

Answer 2

if d is 8 then r will be d:2 which is 8/2 =4
r=4
SA=2pi4^2 +2pi4*18
Sa= 176 pi