Step 1
List given parameters
I = 56 and A = 38
E = 90 , D = 90
I + E + H = 180 Sum of angles on a straight line.
56 + 90 + H = 180
146 + H = 180
H = 180 - 146
H = 34
H + G + A = 180 Sum of angles in a straight line.
34 + G + 38 = 180
G + 72 = 180
G = 180 - 72
G = 108
F + G = 180 Sum of angles on a straight line
F + 108 = 180
F = 180 - 108
F = 72
C + D + E + F = 360 Sum of angles in a quadrilateral
C + 90 + 90 + 72 = 360
C + 252 = 360
C = 360 - 252
C = 108
B + C + A = 180 Sum of angles in a triangle.
B + 108 + 38 = 180
B + 146 = 180
B = 180 - 146
B = 34
Therefore,
B = 34
C = 108
F = 72