In the circle D, The measure of EH is 123°
Circle
A circle is the locus of a point such that all the points in the plane is equidistance from a single point known as the center.
The distance between two endpoints on the circle passing through the center of the circle is known as the diameter. The radius of a circle is equal to half of the diameter.
From the diagram:
∠EDG = ∠EDF + ∠FDG
∠EDG = 57 + 66 = 123°
∠EDG = ∠EDH = 123°
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