A car has two wipers which do not overlap. Each wiper has a blade of length 21 cm sweeping through an angle of $120°$. Find the total area cleaned at each sweep of the two blades.

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Step 1: Area cleaned by 1 blade $= \frac{	heta}{360°} 	imes \pi r^2 = \frac{120}{360} 	imes \frac{22}{7} 	imes 21 	imes 21 = 462$ cm$^2$
Step 2: Total area cleaned $= 2 	imes 462 = 924$ cm$^2$
Step 3: $	herefore$ Total area cleaned is $924$ cm$^2$

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