Aview or judgment not necessarily based on knowledge is an

opinion
fact
truth
reality

A view or judgement not necessarily based on knowledge is an opinion.

The most common meaning of an opinion is a personal view, belief or judgment that rests on grounds that are insufficient to produce complete certainty. Although this belief is held with confidence, it is not substantiated by positive knowledge or proof.

right angles are formed by perpendicular lines. if the lines would extend, to make two intersecting lines, they would form four right angles.

answer; (external conflict)