Find the area of shaded region of circle of radius, Mathematics

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Find the area of shaded region of circle of radius =7cm, if ∠AOB=70o, ∠COD=50o and ∠EOF=60o. (Ans:77cm2)

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Ans:    Ar( Sector AOB + Sector COD + Sector OEF)

=  70/360   Π x 72 + 50/360   Π x 72 + 60/360   Π x 72

49 Π ( 7/36  +5/36  +  6/36 ) = 49 Π x 18/36 = 49/2 x 22/7 = 77 cm2


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