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First, it needs to be a line segment: a line is infinitely long and so has no midpoint.

Suppose the line to be bisected is AB. Place the point of a pair of compasses at A with an arc which is greater than half AB. Draw arcs above and below the line segment. Then, move the compass point to B and without changing the arc width, draw fresh arcs to intercept the previous ones at points X and Y. The intersection of the line segment XY and AB is the midpoint of AB.

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7y ago
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1y ago

To construct the midpoint of a given line, use a compass to draw arcs on both ends of the line that intersect the line. Next, use a straight edge to draw a line connecting the two intersection points of the arcs. This line will pass through the midpoint of the original line.

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Q: How do you contrust the mid point of a given line?
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