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Answer:
here is a example to help, becuase The format is messed up on my side Construct a line CD to cut the line AB at point E.
We know that in the triangle BDE exterior angle is equal to the sum of two opposite interior angles
We know that in the triangle AEC exterior angle is equal to the sum of two opposite interior angles
∠CEB=∠CAB+∠ACE
By substituting the values