In Figure, lines A B\ a n d\ C D interse...

In Figure, lines `A B\ a n d\ C D` intersect at `O`.

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`/_B O D=40^0`, Since AB and CD intersect,`/_AOC=/_BOD`(Vertically opposite angle
`/_AOC=40`,ALSO `/_AOC+/_BOE=70`
`,/_BOE=70-40`
`/_BOE=30`
`/_AOC+/_COE+/_BOE=180`
`/_COE+40+30=180`
`/_COE=180-70=110`
Reflx`/_COE=360-110=250`

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