Answer:
The degree measure of the diameter and the degree measure of the semicircle are the same. Both chords and diameters have two endpoints on a circle. Diameters must intersect the center of a circle.
Step-by-step explanation:
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11
According to question
6 + 4 d = d - 9
4d - d = -9 - 6
3d = - 15
d = -15/3
d = -5
