-25 Points-
Find the measure of angle CHF.

Answer:
∠CHF = 115°
Step-by-step explanation:
∠CHF is a chord - chord angle formed by the chords AC and FB
The measure of the angle is
∠CHF = 0.5( m arc CF + m arc AB, that is
∠CHF = 0.5( 100 + 60 + 30 + 40) = 0.5(230) = 115°