Note: The angle α between diagonals is opposite the side with length l, as shown in the first figure. With the above equations, we can now derive various diagonal of a rectangle formulas that are used by this diagonal of a rectangle calculator:ĭ = √(2l² - P × l + P²/4)) or d = √(2w² - P × w + P²/4) This calculator is designed to supply the area of any length and width in square feet and/or square inches, based on the length and width values entered in. Circumcircle radius of a rectangle r = d/2.Perimeter of a rectangle P = 2 × w + 2 × l.First, let's write down three basic equations for the area, perimeter, and circumcircle radius: How do you find the diagonal of a rectangle in that situation? The answer is provided with our diagonal of a rectangle calculator. ![]() Sometimes, you won't have given the length of two adjacent sides of a rectangle. On the other hand, you can inscribe a circle into a rectangle only if it is a square. The center of a rectangle is equidistant from its vertices therefore, you can always circumscribe a circle on it. They can quickly estimate the perimeter, area, and diagonal of every square you want, just from the length of its side. Try our calculators dedicated to squares, e.g., the square calculator. Its definition is that it has all four sides of equal length alternatively, the angle between two diagonals is right. Its opposite sides are parallel and of equal length, and its two diagonals intersect each other in the middle and are of equal lengths too.Ī square is a special case of a rectangle. ![]() This name derives from the fact that a rectangle is a quadrilateral with four right angles (4 × 90° = 360°). Step 3: Finally, the area of a rectangle will be displayed in the output field. ![]() Step 2: Now click the button Solve to get the rectangle area. The term rectangle comes from the Latin rectangulus, which is a combination of two words: rectus (right, proper) and angulus (angle). The procedure to use the area of a rectangle calculator is as follows: Step 1: Enter the length and width in the input field. And two other parameters which are not shown in the picture:
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