A car has two wipers which do not overlap. Each wiper has a blade of length 25 cm sweeping through an angle of 115°. Find the total area cleaned at each sweep of the blades.
It can be seen from the figure that each blade of wiper would sweep an area of a sector of 115° in a circle with 25 cm radius
Area of such sector = (115/360) ×π × (25)2
= (115/360) × 22/7 × 25 × 25
= 158125/252 cm2
Area swept by 2 blades = 2 ×158125/252 cm2
= 158125/126 cm2
= 1254.96 cm2
≈ 1255 cm2