Midpoint of a Segment

Construct the a segment through points A and B. Use the tool bar to construct the midpoint of the segment. What are the coordinates of the midpoint?
Construct the segment through points C and D. Use the tool bar to construct the midpoint of the segment. What are the coordinates of the midpoint?

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Make a conjecture about how to find the midpoint of a segment when you are given the coordinates of the endpoints.

Kelly Shattuck, June 24, 2008, Created with GeoGebra