Two angle are said to be Supplementary Angles When the sum of the measures of their angles is equal to 180°.
Below Figure represent Supplementary Angles.
In the Above Figure,
∠ ABC = 130° and
∠ PQR = 50°
Now, add both the angles and we get;
∠ ABC + ∠ PQR = 130° + 50° = 180°
Since sum of measure of both the angles is equal to 180°
Therefore, ∠ ABC and ∠ PQR are Supplementary Angles.

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