Mid-segment and bottom side of the triangle is always parallel to each other, and parallel lines must have same slopes, so if their slopes are equal, then MN would be mid-segment of side AB in Triangle ABC
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Answer:
a
Step-by-step explanation:
Answer:
you can't find the square root of a negative
Step-by-step explanation:
Answer: 
Step-by-step explanation:
You are ending by proving 
and 
are supplementary, so right before that, you need to prove their measures add to 180 degrees.
