diagram of a lampshade of diameter 20cm height 30cm and margin 2.5cm ??
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Step-by-step explanation:
Diameter of the base of lampshade, d = 20 cm
radius r = d/2 = 20/2
height = 30 cm
Margin over the top and bottom = 2.5 cm + 2.5 cm = 5 cm
Hence total length of the cloth used
h = 30 cm + 5 cm
h = 35 cm
The cloth required for covering the lampshade = 2πrh = 2 x 22/7 x 10 x 35
= 2200cm²
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