If you have seen maze runner please add me on s n a p : yxng_chxr

that movie is so good my answer is the movies good step-by-step explanation: amazing

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

no this is a nonlinear negative