ruler
Chat with our AI personalities
Set squares are useful for drawing parallel lines and perpendicular lines.
parallel?? Parallel is usually used to talk about lines or similar it means they are equal distance apart. For example railway tracks are parallel.
That's commonly known as a "straight edge".
Parallel lines are lines which share the same gradient. In Euclidean geometry (the geometry used in standard mathematics and day-to-day physics), parallel lines will never meet at a point, but will share every point along their (infinite) lengths if 1 point is observed to coincide with both. The parallel postulate, which is a geometric axiom of Euclid's geometry, defines these properties. However, by moving into elliptical and hyperbolic geometries, parallel lines can be allow to intersect at points (where parallel lines are defined as 2 lines having the same gradient), whilst still retaining logically consistent geometrical definitions. Parallel lines are the opposite of perpendicular lines which meet at right angles.
Railroad tracks, street and highway stripes, most buildings (siding, posts, brickwork, and so forth). Almost in every direction you look, you will see parallel lines.