The curved surface are of a cylinder is 1760 cm2

(c) 20 cm

Curved surface area of the cylinder $=2 \pi r h$

$=2 \times \frac{22}{7} \times 14 \times h$

Therefore,

$2 \times \frac{22}{7} \times 14 \times h=1760$

$\Rightarrow h=\frac{1760}{88} \mathrm{~cm}$

$\Rightarrow h=20 \mathrm{~cm}$

Hence, the height of the cylinder is 20 cm.