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Accepted Solution
A:
Step-by-step answer:Angle ECF = 110 = angle of intercepted (minor) arc EF.The inscribed angles (angles EDF and EHF) are equal to half the angle of the inscribed arc, namely 110/2 = 55 degrees.For your information, an inscribed angle is an angle with its vertex on (circumference of) the circle, formed by two intersecting chords, with a base on the inscribed arc.