This section will teach you how to make sure your dimensions are accurate. The first step is to determine the length of the object that you are measuring in millimeters or inches. Next, you need to measure the thickness in millimeters or inches. Finally, measure the depth of the object in millimeters or inches.
If your measurements are not accurate enough, you can use a ruler to measure and mark off each dimension on your object. Then use a protractor to find out how much is left over when calculating the dimensions of an object, or if it is too wide or too narrow for its depth and thickness.