Question

Find the total surface area of a closed cylindrical drum if its diameter is $50$ cm and height is $45$ cm. $(\pi =3.14)$

Answer 1

Diameter $=50$ cm
Radius $=25$ cm
Height $=45$ cm
Total surface area $=2\pi r(h+r)$
$=2\times 3.14\times 25\times (45+25)=10990$ sq cm
Thus, the total surface area of the closed cylindrical drum is $10990$ sq cm.