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Two angles whos sum equals ninety degrees
The sum of two complementary angles is 90 degrees.
The term supplementary angle is used to refer to angles whose sum is 180 degrees. This is different from complementary angles which add up to 90 degrees.
If the given numbers represent degrees then it is a right angle triangle whos 3 angles add up to 180 degrees.
The three angles in a triangle add up to 180o so if you add the two you know, 34 and 105, you get 139o. Taking 139 from 180 gives 41, so the third angle is 41o.