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.

If you need to rip wood, then the Speed Square can be an asset as well. Because of its lipped fence you can make a straight line the length of the board. It features ¼-inch incre ...

The same number of arcs means the angles are the same size. A square marked at a vertex shows an angle that is exactly 90°. Image caption, The longest side of a triangle is opposite the largest ...