A square has four right angles (90°). Each diagonal splits a corner into two angles of 45°. Note also that the diagonals cut each other in half at right angles. A rectangle has four right angles.

A right angle is 90° or a quarter turn. It looks like the corner of a square or rectangle. You can spot right angles in doors, books or the edge of a piece of paper. An acute angle is less than 90°.

Don’t worry about square corners on your traces ... and acid traps are the reason why you shouldn’t use 90-degree angles. ‘Ease of manufacturing’ is the reason for not using 90-degree ...