Place a measuring ruler or tape alongside the line. Read of the graduation marks which are next to the two points. Subtract the smaller from the larger and the result will be the length of the line segment.
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When a line segment connecting two points is horizontal the length of the segment can be found by finding the absolute value of the difference in x-coordinates of the two points.
I think that you draw a square from that line, and find the area of that square.
Subtract the y-coordinates of the points and take the absolute value
It is the circumcentre of the triangle formed by the three points. Draw the perpendicular bisectors of two of the lines joining the three points. They will meet at the point that is equidistant from the three points.
ruler