Question

Define arms and vertices in lines and angles
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Answer 1

Arms: The two rays joining to form an angle are called arms of an angle. Here, OA and OB are the arms of the ∠AOB.

Vertex: The common end point at which the two rays meet to form an angle is called the vertex. Here, the point O is the vertex of ∠AOB.

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Answer 2

The meeting point of a pair of sides in a polygon is called it's vertex.

The figure formed by 2 rays with the same initial point is called an angle. The 2 rays are also known as the arms of the angle.

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