Suppose we have two angles
∠ ABC and ∠ PQR
Two angles are congruent if
- They have same shape
- They have same size
Now,
All angles of same value will have same shape.
For example:
∠ABC and ∠PQR have
- Same shape - both are angles
- Same size - Both are 30°
So, they are congruent
So, Angles with same values are congruent
Therefore,
Two angles are congruent if they have the same value .
Other examples can be: