**Definition of Vertex of a Polygon**

- Vertex of a Polygon is the common endpoint at which any two of its adjacent sides meet.

**More about Vertex of a Polygon**

- The number of vertices of a polygon is equal to the number of its sides.
- In other words, it is a corner of a polygon.

**Example of Vertex of a Polygon**

- In the above figure, A, B, C, and D are the vertices of the polygon ABCD.

**Solved Example on Vertex of a Polygon**

Find the number of vertices in an isosceles triangle.

Choices:

A. 5

B. 6

C. 3

D. 4

Correct Answer: C

Solution:

Step 1:Vertex of a polygon is the common endpoint at which two adjacent sides of a polygon meet.

Step 2:The number of vertices in an isosceles triangle is 3.

**Related Terms for Vertex of a Polygon**

- Angle
- Corner
- Endpoint
- Line Segment
- Point
- Polygon
- Side
- Two-dimensional Figure
- Vertex of a 3-D Object