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If you are only given one endpoint and a midpoint, you know what the middle of the line segment is. Since the midpoint is half of what the line segment's length is, all you have to do is find the distance between the endpoint given and the midpoint, then add that coordinate to your midpoint and get your other endpoint.

For example:

Endpoint A: (4,5)

Midpoint: (6,8)

Distance between: (2,3)

Add (2,3) to (6,8) and get Endpoint B: (8,11).

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Q: How do you find an endpoint if you are given one endpoint and the midpoint?
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