Looks a homework question so I will give only the method:
a) Add half the difference to the lower number, OR
b) Divide the sum of the numbers by 2 (I.e. find their arithmetical mean).
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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).
midpoint
how do you find distance between points
It is the apex of the parabola.
If you're talking about corner to corner, it's 60 inches. If it's midpoint to midpoint on two opposite sides, then it's 30*sqrt(3).