A mid point divides a line into two equal parts. So, both the end points are at equal distance from the mid point.
Therefore, [tex]MI = DI[/tex].
The mid point is the middle point of a line segment.
It is equidistant from both endpoints, and it is the centroid both of the segment and of the endpoints.
It bisects the segment.
So, both the end points are at equal distance from the mid point.
Therefore, [tex]MI = DI[/tex].
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