You can change the ruler unit from inches to centimeters, millimeters, points, and Picas. Points are used when you need to simulate pixels, while Picas are typically used to represent fixed ...

Stretch the length of string out along a ruler or measuring tape, and take down the length in millimeters. The length you measured is the circumference of your finger—to calculate the diameter ...

A protractor acts in a similar way to a ruler in that it allows you to both measure and draw accurately. The two most popular types are the semi-circular (0-180 degrees - pictured above ) and a ...