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Answer:
302°
Step-by-step explanation:
You want the measure of arc PRS, given PR is a diameter, and central angle RTS is 122°.
The measure of arc RS is the same as that of central angle RTS, 122°. The measure of arc PRS is the sum of the measures of its parts:
arc PRS = arc PR +arc RS
arc PRS = 180° + 122°
arc PRS = 302°