Question 984693
Angle 1=66
Angle 2=x
Angle 3 = (1/2)x + 57.
;
Therefore, 66+x+(1/2)x+57=180
1.5x + 123=180
1.5 x = 57
x=38 degrees, dividing both sides by 1.5
;
Angle 1 is 66
Angle 2=38  ANSWER
Angle 3=76 units all degrees. ANSWER 

They add to 180 degrees.