The diameter of a cylinder is 28 cm and its height is 20 cm.

(b) 2992 cm2

The total surface area of the cylinder $=2 \pi r+2 r^{2}$

$=2 \pi r(h+r)$

$=\left[2 \times \frac{22}{7} \times 14 \times(20+14)\right] \mathrm{cm}^{2} \quad\left[d=28 \mathrm{~cm} \Rightarrow r=\frac{28}{2} \mathrm{~cm}=14 \mathrm{~cm}\right]$

$=\frac{20944}{7} \mathrm{~cm}^{2}$

$=2992 \mathrm{~cm}^{2}$