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Are alternate exterior angles on parallel lines ever supplementary?
Only if they add up to 180 degrees which would be the case if the parallel lines are cut through by a perpendicular line.
Does the uppercase letter L demonstrate parallel or perpendicilar lines?
Perpendicular perpendicilar Parallel means that they are next to each other without ever intersecting. Perpendicular is two lines that intersect at a 90 degree angle, like the corner of a room or the uppercase L.
Do parallel lines ever meet?
Parallel lines never ever meet with each other
Do coplaner lines ever intersect?
if they are parallel -- no. if not parallel -- yes
What lines are parallel?
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.
