A triangle (or other polygon) on a concave surface (such as the inside of a sphere), possibly.
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Two angles whose sum is 90 degrees are called complementary angles.
They are supplementary angles
Two angles whose sum is 180 degrees are supplementary. If it is 90 degrees then they are complementary.
SUPPLEMENTARY ANGLES are two angles the sum of whose measures is 180 degrees.
It is a plane six-sided figure, each of whose sides is of length s units and each of whose interior angles is 120 degrees.