In Fig. 6.13, lines AB and CD intersect...

In Fig. 6.13, lines AB and CD intersect at O. If `/_A O C\ +/_B O E=70^@`and `/_B O D=40^@`, find `/_B O E` and reflex `/_C O E`.

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Let `∠AOC = x` and `∠BOE = y`.
Then` x + y = 70^@` ( `∠AOC + ∠BOE = 70^@`)
Let Reflex `∠COE = z`
...

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