The radius of a circle is 21 cm. Find the perimeter and area of a quadrant of the circle.
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Solution
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Radius of a circle, r = 21 cm Perimeter of a quadrant, P=(π2+2)r units =(227×2+2)×21=(2214+2)×21 P=(22+2814)×21=5014×21 =75cm. Area of a quadrant, A=πr24 sq. units A=227×21×214 =346.5cm2.
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