Use Angular when you need to design web apps for all kinds of environments, especially: Dynamic web apps: Where the content and some components are displayed according to the user who is accessing and the client (web or mobile) that is consuming.

What is angularity in GD&T?

Angularity is the symbol that describes the specific orientation of one feature to another at a referenced angle. It can reference a 2D line referenced to another 2D element, but more commonly it relates the orientation of one surface plane relative to another datum plane in a 3-Dimensional tolerance zone.

What type of tolerance is perpendicularity?

Perpendicularity tolerance is a three-dimensional geometric tolerance that controls how much a surface, axis, or plane can deviate from a 90 degree angle or it is can be defined as a condition of a surface, median plant, or axis at 90 degree to a datum plane or axis.