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Answer :
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.