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.

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For example:
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∠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
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same value
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.

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Other examples can be:
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