Question

What is the surface area of the cylinder? The diameter is 18ft and the height is 12ft.

540π ft^2
378π ft^2
216π ft^2
594π ft^2

Answer 1

SAcylinder=sides+top and bottom
top=circumference times height
top and bottom=2 itmes circle

d=18
d/2=18/2=9=r
top and bottom=2pir^2=2pi9^2=2pi81=162pi

sides
c=2pir=18pi
height=12
sidearea=18*12*pi=216pi

add
162pi+216pi=378pi ft^2

Answer 2

surface area of a cylinder = 2πr^2 + 2πrh = 2π x (18/2)^2 + 2π x (18/2) x 12 = 162π + 216π = 378π ft^2