The measure of m<FEJ is 75 degree
From the given figir, we can see that;
m< FHG = m< EFJ = 15 degrees
Since the sum of angles in a triangle is 180 degrees, hence;
m< EFJ + 90 + m<FEJ = 180
15+ 90 + m<FEJ = 180
m<FEJ = 180 - 105
m<FEJ = 75 deegrees
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