#### Answer

180$^{\circ}$

#### Work Step by Step

Arc STR is a semicircle so its measure is 180$^{\circ}$.

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Published by
Brooks Cole

ISBN 10:
9781285195698

ISBN 13:
978-1-28519-569-8

180$^{\circ}$

Arc STR is a semicircle so its measure is 180$^{\circ}$.

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