An open cylinder has only one base. Its diameter is 21 and one fourth in.21 1 4 in., and its height is 18 and one fourth in.18 1 4 in. Use a net to find the surface area of the cylinder. Use 3.14 for piπ.
2πrh+2πr2 is the surface area of a cylinder formula
r= 10.625
h=18.25
surface area = about 1927.66
here is the net:
make sure to lable the radius and height! :-)
hope that helps!
Surface area =
pi [ dh + (d/2)^2] where h is the height and d is the diameter ......so we have....
3.14 [ 21.25 * 18.25 + (21.25/2)^2] = about 1572.21 in^2
