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construction- join OC
OC=OA=OB (as O is center of circle)------1
let angleA=a,angle B=b, angle ACO=c, angle BCO=d
a=b=c=d(from 1)
a+b+c+d+140=360
4a=220
a=55
so, angle ACB=110
OC=OA=OB (as O is center of circle)------1
let angleA=a,angle B=b, angle ACO=c, angle BCO=d
a=b=c=d(from 1)
a+b+c+d+140=360
4a=220
a=55
so, angle ACB=110
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