Perimeter of a rectangle how to#

P = 60 y d s How to find perimeter of a rectangle with area Have you ever heard about the golden rectangle? It is a special rectangle, the side lengths of which are in golden ratio.For our pictured square, we plug in our area, find its square root, and 4 to get the total perimeter:

Also, remember that the perimeter of a rectangle calculator assumes that the length is longer than the width! Note: The angle α between diagonals is in the front of the length like in the first figure.

Given angle and circumcircle radius: P = 2 * r * (2*sin(α/2) + 2*cos(α/2)).

Given area and circumcircle radius: P = √ + √,.

Given lenght/width and area: P = 2*l + 2*A/l or P = 2*w + 2*A/w,.

With the above equations we can now derive various perimeter of a rectangle formulas that are used by calculator on this site:

Circumcircle radius of a rectangle r = d/2.

Diagonal of a rectangle d = √(l² + w²),.

Before we write down appropriate formulas, there are three basic equations for the area, diagonal and circumcircle radius of a rectangle that you should remember: How to find the perimeter of a rectangle in these situations? Most of these problems can be solved with our perimeter of a rectangle calculator. However, in some mathematical problems, there are different quantities given. To calculate the perimeter in the above equations, we have used two sides of a rectangle.

Check out our perimeter, area and diagonal of a square calculators if you need to solve specific problems with squares! Square is a quadrilateral with four right angles and all four sides of equal lengths. In fact, you can do it only with a square which is special case of a rectangle. However, you can't inscribe a circle into every rectangle. Moreover, the center of this circle lies exactly at the intersection of two diagonals.

You can always circumscribe a circle on the rectangle because its center is equidistant from all of its four vertices. There are two other characteristic quantities which are not shown in the picture: In the picture below, you can see a typical rectangle with marked parameters: Rectangle has two diagonals which intersect in the middle of the rectangle and are of equal lengths. The opposite sides of rectangle are parallel to each other and of equal length. Its name is derived from the Latin word rectangulus which means right ( rectus) angle ( angulus). Rectangle is a quadrilateral with four right angles (4 * 90° = 360°). In the following text, we explain in detail how to find the perimeter of a rectangle with 10 different perimeter of a rectangle formulas. Try to enter some values or read on to learn more about rectangles. Use our perimeter of a rectangle calculator if you need to quickly estimate what is the perimeter of a specific rectangle.