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You can calculate each rectangle’s area, diagonal length, or perimeter through this calculator. Thus, every rectangle has two diagonals forming a triangle with two corners of 45-degree angle and one of a 90-degree angle. These lines are called diagonals, and they cut the rectangle into two pieces, called triangles. If you draw a line and connect two opposite corners of a rectangle, you will cross two lines and have one joint. It resembles a square a lot by its look, but the square has all sides of equal size.

The longer side is called the length of the rectangle while the shorter width. By definition, a rectangle is a given parallelogram with four sides, two parallel pairs with 90 degrees corners each. Let’s look at a rectangle in particular and see how geometry defines it. All the geometry forms are pretty complex, and you have so many formulas to remember about them. I remember I was scared of how many formulas I needed to know and to distinguish different given geometry forms, like a rectangle, cube, circle. It wasn’t very comforting for me at first. I remember the day when I first come across geometry in high school. Sum and difference identities calculator.Take a look other related calculators, such as: Besides giving you the perimeter of the rectangle, the calculator also shows you information about the diagonal length, area, angle between diagonals, and circumcircle radius, all for free. We use the Perimeter of a Rectangle Calculator to calculate the rectangle’s outer part by adding its four (two long and two short) sides.