The common endpoint of an angle is:

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Vertex

Zero

End point

None of these

answer is A.

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Detailed Solution

Concept: A ray has a single endpoint and extends indefinitely.
When two rays make an angle, the endpoints meet at a certain point.
In a ray the endpoint is where the ray starts.
When two rays start from the same point their endpoints meet making a certain angle.
Vertex is the common endpoint of an angle.
Hence, the correct answer is option 1.

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