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).
A ruler is a straight edge
Straight Edge
A straight edge
Generally a ruler is a straight edge, but it can be anything... I generally just use a spare pencil.
A ruler is usually graduated so that it can be used to measure lengths. A straight edge is just that: it has no marking to help you measure lengths.
A ruler is a straight edge
A ruler is a straight edge
A Ruler
A ruler can be classed as a straight edge.
A ruler or straight edge.
Called a straight edge
Straight Edge
A straight edge
A rule is a ruler that starts on the edge and a ruler starts off set from the edge.thank you
Like: "The edge of a ruler is straight" or "I walked straight to the store"
A straight edge is basically another name for a ruler, or it could be anything that makes straight lines.
Straight lines on paper can be drawn by using the edge of a ruler (or straight-edge) and a pencil.