On a miter saw, when you're cutting a 90 degree cut, the miter saw reads zero. On a protractor, it reads 90. So it's an unending source of confusion for people. RON HAZELTON: So Mark, show me how it works.
A ruler is used to measure units of length, inches, feet and yards. Standard rulers have inches on one side and centimeters on the other. A typical ruler measures up to 12 inches, and is equivalent to 30.48 centimeters. This is also equivalent to 1 foot. Each inch on a ruler has markings in between that are a fraction of an inch.
But the entire ruler isn't even getting to the entire length of this rectangle. So this isn't measured correctly. And they say, Two rulers measure the eraser and overlap.. Oh, I see, this is kind of, the ruler's a little bit transparent, so this one is overlapping with the one underneath.