Closed drum

Find the total surface area of a closed cylindrical drum if it's diameter is 50 cm and height is 45 cm . (π= 3.14)

Correct result:

S =  10995.5743 cm2

Solution:

D=50 cm h=45 cm  r=D/2=50/2=25 cm S1=π⋅ r2=3.1416⋅ 252≐1963.4954 cm2 S2=π⋅ D⋅ h=3.1416⋅ 50⋅ 45≐7068.5835 cm2  S=2⋅ S1+S2=2⋅ 1963.4954+7068.5835=10995.5743 cm2=1.100⋅104 cm2

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