Question
Area of sector of a circle whose radius is 21 cm, is
327.25 cm 2 . Find the angle subtend by arc at the center of circle. (Use π = 22/7)Solution
Area of sector = (A/360) X π X radius 2 , where 'A' is the angle subtended by arc at the centre
So, (A/360) X (22/7) X 21 2 Â = 327.25
Or, (A/360) X 1,386 = 327.25
Or, 'A' = 85
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