One reads a ruler by using the hash marks on the ruler to read off each large number, which denote inches. After one reads the inch on the ruler, then one reads the smaller linear marks next to that inch, which indicate ... More » Math Geometry

The little lines on a metric ruler mark the millimeters between centimeters, while the little lines on an English ruler mark the eighths and 16ths between inches. Some English rulers may only have lines at every 1/2 inch... More » Education K-12

A 12-inch ruler has numbers and a line for every inch. Between each inch mark, there are fraction lines. The length of the line corresponds to the size of the fraction. A standard ruler has marks for the inch, half-inch,... More » Science Measurements
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Linear inches refers to the combined number of inches of an object's height, length and width. The sum is obtained by measuring the height, length and width of a specific object, such as a piece of luggage, with a ruler ... More » Math Geometry

To use a ruler, place it alongside or on top of the object or line that is to be measured and count the number of marks from edge to edge of the object. For those who are working with a metric ruler, the longer lines are... More » Science Measurements

The primary difference between a ruler and straightedge is that a ruler is a measurement device, whereas a straightedge is a tool for drawing or viewing straightness. A ruler is a straightedge with some scale on it so th... More » Math Geometry

A square with an area of 49 square inches has a perimeter of 28 inches. According to, the formula for the area of a square is length times width. Since a square has equal sides, the equivalent formula is a side... More » Math Geometry