130 degrees
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A pair of supplementary angles add up to 180 degrees. Therefore, the supplement of any angle x is equal to 180 - x degrees. For example, the supplement of a 130 degree angle is equal to 180 - 130 = 50 degrees.
It is an isosceles triangle because the third angle must measure 50 degrees
If that is the angles of a triangle then the 3rd angle is 110 degrees
Any polygon can have a 50-degree angle. It doesn't have to, but it can.
A 40 degree angle is the COMPLEMENT of a 50 degree angle.