A right angle.
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A supplementary angle can have any value - depending on the first angle.
Supplementary angles add up to 180 degrees
A triangle is a polygonal shape, not an angle and therefore, cannot have a supplementary angle.
Yes. Supplementary angles add to 180o, so the angle which is its own supplement would be 90o.
A supplementary angle can not be a complementary angle. The complementary angle has 2 angles equal 90... but a supplementary angle is X2 that much (108). * * * * * Nearly correct. 90 x 2 is 180, not 108!