Assuming you are referring to a triangle. In Euclidean, or plane geometry, always to 180 degrees. In non-Euclidean geometry either more or less than 180 degrees.
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They add up to 180 degrees
There are 3 angles in an isosceles triangle and 2 of them are equal in size. The 3 interior angles add up to 180 degrees.
An isosceles trapezoid has 2 pairs of equal angles of different sizes and they add up to 360 degrees
Its 4 interior angles add up to 360 degrees
It will have 2 pairs of equal angles that add up to 360 degrees