Answer:
124 degrees
48 + 76 = 124
180 - 124 = 56
Angle 1 = 180 - 56
124 degrees
Proof
the line is = to 180 degrees in total ( just imagine it like 180 degree gymnastics splits )
now you say angle (let's call it angle 4) is 56 degrees. so since it's at the bottom where angle one is, you say 180 - 56
another method is to say, 180 - the angle that you found (angle 4) and the answer is 56 in your case, you still get the same 124 degrees which is now the missing angle for angle 1
