Because it's a lifestyle that they choose. I myself I'm Straight-Edge because it's more healthy, other people may have different reasons.
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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 tattoo that has something to do with straight-edge, a subculture and lifestyle choice about not drinking, doing drugs or having casual sex. a straight-edge tattoo could be lyrics from an edge band or x's.
Straght edge is a lifestyle within the hardcore music scene where people who live by the lifestyle mainly obtain from drugs, alcohol and tobacco products some also are vegan obtain from sex, caffeine and and medicines or medcations. straight edge is not a gang and anyone can be straight edge
Generally a ruler is a straight edge, but it can be anything... I generally just use a spare pencil.
A straight line from the center of a circle to the outer edge is called a radius.