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In a figure OBQ represent is a windowscreen wiper on a car. The rubber blade BQ of the wiper is 21 cm long. it

In a figure OBQ represent is a windowscreen wiper on a car. The rubber blade BQ of the wiper is 21 cm long. it rotated about 0, and the largest Angle made AOB is 120 degrees PQ is 65 cm. Find a/ The length of OB b/ The area swept by rubber blade BQ.

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