Geometry

The answer is A. 13.

 

1. Recall the property of congruent line segments:

If , then by the definition of congruent line segments, the length of  is equal to the length of , that is .

 

Also, note that the order of the endpoints of a line segment does not affect its length. So  and  represent the same line segment, and .

 

The fact that  is irrelevant to finding the length of  since we are interested in the relationship between

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