Work out surface area of a cylinder

Answer:
42477.2
Step-by-step explanation:
radius times height times 2 times pi
times that by
radius times radius times 2 times pi
diameter=8
radius=4
4 times 16.8=67.2
times by 2 =134.4 times pi=422.23
now do 4 times 4 times 2 times pi=
110.53 times 422.23=42477.2
please mark me as brainliest!!<3