Which equation correctly describes the relationship between the measures of the angle and arcs formed by the intersecting secants?


The correct option is (b).
The measure of each angle generated when two secants or chords cross paths inside of a circle is equal to the product of the lengths of their intersected arcs, divided by two.
In this question we apply intersecting secants theorem ,
according to theorem we subtract arc PQ to arc RS.
PQ- RS
Then, m∠1 = [tex]\frac{1}{2}[/tex] ( m PQ - RS )
Therefore , the correct relation is option B.
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