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First find the area of minor segment wid the help of formula then find the area of CIRCLE -area of Minor Segment.the degree 120 will become 60degree
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sin(theta)/2*cos( theta)/2=sin(theta)
sin(theta)/2 = sin60degree
its an identity of half angles
Use pi*r^°/360 for getting the area of sector then subtract the area of triangle from that sector's area
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