It is an isosceles triangle because the third angle must measure 50 degrees
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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.
Since a right triangle has 180 degree angles in it, you know 2 angles already. One is the 90 degree angle, since the triangle is a right one. The other is 40 degrees, as in your statement. 90 plus 40 is 130. 50 degrees is the missing angle since 50 + 40+ 90 equal 180 degrees. Hopefully that helped you.
50 degrees