Answer: Always true.
Step-by-step explanation:
When two angles are added up to 180°, then the pair of angles is called as supplementary angles.
Since, the measure of right angles = [tex]90^{\circ}[/tex]
Therefore, the sum of two right angles will be :_
[tex]\text{Sum}=90^{\circ}+90^{\circ}=180^{\circ}[/tex]
Therefore, The angles are supplementary angles.
Hence, The statement "If two angles are right angles they must be supplementary" is always true.
