One right angle = 90 degrees so 180 degrees = 2 right angles.
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2 angles whose sum is 180 are called supplementery angles.an example of supplementary angles are two right angles.=)
Right angles are 90°. The total measure of a triangle is 180°. So, the sum of the other two angles must equal 90°.
Coz all 3 angles have to add to 180. If you add 2 90's you get 180 so there are no angles left for the third corner.
Not always. If two angles are congruent then they simply have equal measure. They must only be right angles if they are supplementary, that is, they must both add up to 180 degrees.