Answer:
(d) 108°
Step-by-step explanation:
An inscribed angle is half the measure of the arc it subtends. Conversely, the arc is twice the measure of the inscribed angle it subtends.
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using the relation
We can define the vertex of the marked angle as point Q. Arc XY is twice the measure of inscribed angle XQY:
arc XY = 2(54°) = 108°
