Geometry

The correct answer is A.RS = 7 and ST = 7.

1. Recall the property of a midpoint:

If a point is the midpoint of a line segment , then it divides the line segment into two congruent sub - segments. That is, .

Also, by the segment addition postulate, for three collinear points , , and , .

Since and , we can substitute with in the equation . So we get .

2. Solve for and

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