Respuesta :

TheRapture
50 is the correct answer When you have an external angle the two interior angle on the opposite side of the triangle add up to the external angle.
So 140 = 90 + x
50 =x is correct
olemakpadu
Angle 1 = 90 + Angle 3          

Exterior angle = sum of opposite interior angles in a triangle.

Angle 1 = 90 + Angle 3

140 = 90 + Angle 3

Angle 3 = 140 - 90 = 50

Angle 3 = 50