Question

CRITIQUE REASONING Justin knows that point R is the midpoint of OS, and he knows that this me says that PR=PQ+ OR by the Segment
So PR = PQ+ RS by substitution. Do you
reasoning? Explain.
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Answer 1

Since R is the midpoint of OS, OR = RS, because the definition of the midpoint is a point that is equidistant to the other two points.

PR = PQ + OR

PR = PQ + RS because of the reasoning above.