We sometimes call a line a line segment instead. We do this because a line is supposed to go on forever in both directions, so when it doesn’t, we say we’re just looking at one ‘segment’ of the line.

The midpoint of a line segment is the point right exactly bang in the middle of it. You can find it by measuring it with a ruler, but actually there’s a more accurate way of doing it, using a compass.

Using a compass

We draw a semi circle, with the 'centre' at one end of the line segment, and the radius asthe length of the line. We do the same at the other end of the line. We then draw a line where the two semi circles meet.

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