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A ruler is a straight edge
You could align the edge of the object with the zero on the ruler and then read off the marking on the ruler which aligned with the other end of the object.
Straight Edge
A ruler has markings, a straight edge does not. In "straight edge and compass" constructions, you are not allowed to mark the straight edge. Things that are impossible using only a straight edge and compass are possible if markings are allowed (for example, it's possible to trisect an angle using a marked straight edge).
Use a ruler to measure it.
When the ruler is sticking out further from the edge of the table, it is more easily influenced by external forces such as air currents, causing it to vibrate more. The longer unsupported length of the ruler also allows it to bend more easily, contributing to the increased vibrations.
A ruler is a straight edge
the edge
A ruler is a straight edge
A ruler can be classed as a straight edge.
Called a straight edge
horizontal ruler
A Ruler
Horizontal ruler
You could align the edge of the object with the zero on the ruler and then read off the marking on the ruler which aligned with the other end of the object.
Along the edge.
Straight Edge