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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.
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The length of a line between two points, (x1,y1) and (x2,y2) on a Cartesian Plane is given by the formula: length = square root [ (x2 - x1)2 + (y2 - y1)2 ]
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.
I think that you draw a square from that line, and find the area of that square.