No, but they're "supplementary".
Two "complementary" angles add up to 90°. Each right angle is 90° all by itself,
so two of them aren't complementary.
But two "supplementary" angles add up to 180°, and that certainly describes
two right angles of 90° each.
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A right angle.
No? Wouldn't they then be supplementary? Opposite rays make a straight angle/line, and if the exterior sides made the straight angle, the adjacent angles would be supplementary. ...Right?
No. A triangle with two complementary interior angles will always result into right triangle. The sum of the complementary angles will always be 90 degrees and the other one will be 90 too.
Two right angles would always be supplementary because the sum of their angles is 180 degrees.
Yes, two right angles can be adjacent to one another. In the letter "T", it's formed by two adjacent right angles.