The value of ∠f is 19.5 degrees, the value of ∠f is calculated by using sum of the triangle's angle.
Sum of triangle's angle based problem:
What information do we have:
∠g = 33.5 degrees
∠h = 127 degrees
Sum of triangle's angle = 180
So,
∠g + ∠h + ∠f = 180
33.5 + 127 + ∠f = 180
160.5 + ∠f = 180
∠f = 180 - 160.5
∠f = 19.5 degree
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