Copying a Segment

Using a straightedge and a compass, it is possible to construct a copy of a segment.

To copy AB, these three steps can be followed.

Draw a Segment Longer Than AB

Using a straightedge, draw a segment longer than the original.

Measure AB with a Compass

To make a segment with the same length as AB, measure the original segment with a compass. To do so, place the needle point on one of its endpoints and place the pencil on the other end.

Mark Point B' on the New Segment

The compass is now set to the correct length. After moving the compass to the new segment, mark where the end should be with the pencil.

This mark shows where to place the endpoint of the new segment.

It has been shown that A'B' has the same length as AB.

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