### Theory:

A triangle is a polygon with three vertices, three edges and three angles.

In the above triangle \(ABC\):

- \(A, B\) and \(C\) are vertices.
- \(a, b\) and \(c\) are edges (side lengths).
- \(x, y\) and \(z\) are angles.

Example:

In the above triangle \(ABC\):

- \(A, B\) and \(C\) are vertices.
- \(8\) units, \(5\) units and \(5\) units are the side lengths.
- \(94°, 43°\) and \(43°\) are interior angles.