Answer:
67°
Explanation:
points a, g, and d are all laying on a straight line. the angle of a straight line is 180 degrees. angle fge is 90 degrees, like it says above, and according to the vertical angles theorem, the angle across from it will also be 90 degrees. this would be angle bgc, which you can see is a 90 degree angle. so, we know that the two angles on the right of agb are 90 degrees and 23 degrees, so you'd add those together and get 113. 180 degrees, (the degree of a straight line) - 113 is equal to 67. so the angle is 67 degrees.