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A car wiper has two blades each of length 56 cm. How much area will they both sweep if each makes an angle of 135° while it moves. (π= $\frac{22}{7}$ )

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7392 cm2

7456 cm2

7248 cm2

7500 cm2

answer is A.

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Detailed Solution

Area swept by two blades = 2 \times (Area of sector)

= 2 (\frac{135}{360} π 56^{2})

= 2 \times \frac{135}{360} \times \frac{22}{7} \times 56 \times 56

= 7392 c m^{2}

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