Question

What is the missing angle

Answer 1

The missing angle is 53 degrees (82+45=127) (180-127=53)

Answer 2

The sum of interior angles in a triangle is 180°
So the expression would be
∠1 + ∠2 + ∠3 = 180°

Input the numbers to find the third angle
∠1 + ∠2 + ∠3 = 180°
82° + 45° + ∠3 = 180°
127° + ∠3 = 180°
∠3 = 180° - 127°
∠3 = 53°

The missing angle is 53°