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A car has two wipers which do not overlap. Each wiper has a blade of length $21$ cm sweeping through an angle of $120^\circ$. Find the total area cleaned at each sweep of the two blades.
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Area cleaned by $1$ blade = $\frac{22}{7} \times 21 \times 21 \times \frac{120^\circ}{360^\circ}$
$= 462$
Total area cleaned = $2 \times 462 = 924$
$\therefore$ Total area cleaned is $924$ cm$^2$
$= 462$
Total area cleaned = $2 \times 462 = 924$
$\therefore$ Total area cleaned is $924$ cm$^2$