Question

Which angle is an exterior angle of the triangle?

Triangle L M N. Angle L is 1, angle M is 2, angle N is 3. Side M N extends to form angle 4.
1
2
3
4

Answer 1

In a triangle, an exterior angle is formed when one of its sides is extended outward. In your description:

- Triangle \( L \) \( M \) \( N \) has angles \( \angle L \), \( \angle M \), and \( \angle N \).
- Side \( M N \) is extended to form angle \( 4 \).

Angle \( 4 \) is the exterior angle corresponding to the triangle, specifically at vertex \( N \). The exterior angle is formed by one side of the triangle and the extended line from another side.

Thus, **the exterior angle of triangle \( L \) \( M \) \( N \) is angle \( 4 \)**.