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2 angles whose sum is 180 are called supplementery angles.an example of supplementary angles are two right angles.=)
A triangle, all of whose angles are acute.A triangle, all of whose angles are acute.A triangle, all of whose angles are acute.A triangle, all of whose angles are acute.
The fact that corresponding angles are congruent does not require corresponding sides to be proportional - except in the case of a triangle. For quadrilaterals, think of a square and rectangle.
sum of interior angles = (n-2)180=1080 1080/180=n-2 6=n-2 8=n
They are called supplementary angles. See the related link below for more information.They are complementary angles that add up to 90 degrees