Question
Arjun, cycling at a speed of 81 km/hr, can complete one
round of a square field in 8 seconds. The radius of a circular field is 4 meters more than each side of the squared field. Calculate the area of the circular field.Solution
ATQ, Perimeter of the squared filed = {81 Ă— (5/18)} Ă— 8 = 180 metres Therefore each side of the squared field = 180/4 = 45 metres Radius of the circular field = 45 + 4 = 49 metres Therefore, area of the circular field = Ď€r2 = (22/7) Ă— 492 = 7546 m2Â
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