You know the angle is 1=35 degrees. Angle 2 is a right angle, right angle =90 degrees,

The following triangle theorem: the sum of three internal angles+180 degrees.

108 degree—where two internal angles = another internal angle,

Then: angle 3? =? 180 -35 -90 =55 degrees

So; Angle 1=35 degrees? Angle 2=90 degrees? Angle 3=55 degrees