Answer:
Step-by-step explanation:
The square in the left lower corner means that the angle is a right angle or 90 degrees.
The two given angles must add to 90 degrees.
x + 42 + 3x = 90 Combine the left
4x + 42 = 90 Subtract 42 from both sides
4x = 90 - 42 Combine
4x = 48 Divide both sides by 4
4x/4 = 48/4
x = 12
Now what do you need?
x = 12
angle 1 = 3x = 3*12 = 36
angle 2 = x + 42 = 12 + 42 = 54
