A car has two wipers which do not overlap each wiper has a blade of land 21 cm sleeping through an angle of 120 degree find the total area cleaned at each side of the blade
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HERE IS YOUR ANSWER
area of each sector = 120/ 360 ×π(21)^2
= 120/360 ×22/7× 441
= 1/3 ×22×63
=1/3 × 1368
=1368/3
= 456 cm^2
Area swept by 2 blades = 2× 456
= 912cm^2
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