Question
Find the area of sector of a circle whose radius is 21
cm and angle subtended by the sector at centre of circle is 45 ° .Solution
Area of sector = (A/360) X π X radius 2  (Here 'A' is the angle subtended by sector at centre)
So, required area = (45/360) x (22/7) X 21 2 Â = 173.25 cm 2
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