In figure below, you see the frame of a lampshade. It is to be covered with a decorative cloth. The frame has a base diameter of 20 cm and height of 30 cm. A margin of 2.5 cm is to be given for folding it over the top and bottom of the frame. Find how much cloth is required for covering the lampshade.

Given :
Height (h) of the frame of lampshade = (2.5 + 30 + 2.5) cm = 35cm
Radius (r) of the circular end of the frame of lampshade = \(\frac{20}{2}\) m = 10 m

Now, Cloth required for covering the lampshade
= \(2{\pi}rh\)
= \(2 × \frac{22}{7} × 10 × 35\) \({cm}^2\)
= (44 × 10 × 5) \({cm}^2\)
= 2200 \({cm}^2\)

Hence, for covering the lampshade, 2200 \({cm}^2\) cloth will be required.