You can put this solution on YOUR website! find the 3rd angle of the larger triangle
180 - 54 - 45 = 81 degrees
find the associated angle of the smaller triangle
81 - 27 = 54 degrees
find the 3rd angle of the smaller triangle
180 - 54 - 54 = 72 degrees
Angle 1 is opposite and equal to 72 degrees also