Answer: 38 degrees.
Reasoning: The triangle on the left is an isosceles trainable. Meaning two of the angles are the same. That means that #1 is 62. A single triangle is equal to 180 degrees so 62+62=124 and 180-124=56 which means #2 is 56. Now, 2 & 3 are supplemental so added up they equal 180. So 180-56=124. #3 is 124 degrees. Now to figure out angle 4 all you have to do is add up 124+18=142 and take that from 180. 180-142=38. Angle #4 is 38 degrees.