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Verizon [17]
3 years ago
8

Please see attatchment for question. Please include all postulates/theorems used to solve it, if possible. Also include the lett

er (A,B,C, or D).

Mathematics
1 answer:
vladimir1956 [14]3 years ago
4 0
1. If two secants intersect to form the vertex of an angle outside a circle and the sides of the angle intercept arcs on the circle, then the measure of the angle is equal to one-half the difference of the measures of the arcs intercepted by the sides of the angle.  A prudent auxiliary line is a chord connecting points of intersection of the sides of the angle with the circle as shown at the right.<span>  
</span><span>2. Inscribed angle theorem.   The measure of an inscribed angle is equal to one-half the measure of its intercepted arc. 
</span>
According to 2. : measure of arc RT = 2 m (angle S) = 60
Apply 1. : m(angle U) = (arc RS - arc RT )/2 = (84 - 60)/2 = 12
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