Lets just solve all the angles:
B = 180 - ( I + J)
I = 56 degrees, J is 90 degrees because D is 90; because angles on straight line add up to 180 degrees.
so B is 180 - ( 56+90), which equals 34 degrees.
Angle C = 180 - (B +A); angles in a triangle add up to 180 degrees.
B = 34, A = 38,
so C is 180 - (34+38)
= 108 degrees.
Angle F = 360 - (E + D + C); angles in a quadrilateral add up to 360 degrees.
E = 90, D = 90, and C = 108.
So F = 360 - ( 90 + 90 + 108), which equals 72 degrees.
Hope this helps! If you are not satisfied you can as any question.
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