Question

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​

Answer 1

$\huge \underline \mathbb {SOLUTION:-}$

Given:

• Radius (r) = 25 cm
• Sector angle (θ) = 115°

Since there are 2 blades,

The total area of the sector made by wiper = 2 × (θ/360°) × π r²

= 2 × 115/360 × 22/7 × 252

= 2 × 158125/252 cm²

= 158125/126

= 1254.96 cm²

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Answer 2

Answer:

• area covered by 2 wipers = πr^2×angle÷360×2
• =πr^2÷2
• =22÷14×25
• 39.285cm^2