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Q.

Find the area of a quadrant of a circle whose circumference is 22 cm.

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Detailed Solution

Let the radius of the circle be r 

Thus, the Circumference of a circle  = 2πr = 22 cm

Therefore, r = Circumference /2π

we know that, A quadrant of a circle means one of the four equal parts. 

Therefore, 

the area of a quadrant = 14 × Area of a circle

= 1/4 × πr2

Radius = r = circumference/2π

= 22/(2 × 22/7)

= (22 × 7)/(2 × 22)

= 7/2 cm

Therefore, the area of a quadrant = 14 × πr2

= 1/4 × 22/7 × 7/2 × 7/2

= 77/8 cm2

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