I did not understand the answer in Maths:Lines and Angles:Linear Pair of Angles:Example 4

Question:Letbe three rays such thatis between . If BOC + COA = 180, then prove that A, O, B are collinear, that is, they lie on the same straight line.

Please clear the doubt as soon as possible as exams are near

Thanks

As you can see from the figure, ∠BOC + ∠COA = 180, and B,O,A lie on a straight line  also is between.

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Letbe three rays such thatis between.If BOC+ COA = 180, then prove that A, O, B are collinear, that is, they lie on the same straight line.

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