If M is the midpoint of LN, what must be true?

The answer is B. LN = 2MN.

1. Recall the definition and properties of a mid - point:

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

Also, by the segment - addition postulate, . Since , we can substitute with (or vice - versa) in the equation . So, (because ) or .

2. Analyze each option:

A: . Since is the midpoint of , (where is the same as ), not . So this option is False.

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Geometry