# angles opposite to equal sides of triangle are equal

- Author:
- Mathguru

- Topic:
- Angles

Length of sides in a triangle change when its angles are changed.
On the screen, you see a triangle ABC in red color.
Observe how the length of sides in this triangle change when Angle B = α and Angle A = β are changed using their respective slide bars.

Questions to think about
1. What is the relation between sides AC and BC when we set α=β using their respective slide bars?