Tell us, who wasn’t confused at least on one geometry topic? It’s not like it’s the easiest class to exist. So no wonder that you would turn online (to this guide particularly) to try and answer the question of how to square a rectangle. So, let’s not waste our time whining about how hard math is, and finally find the answer to your question.

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A Guide to Squaring a Rectangle

First, let’s establish what ‘squaring a rectangle’ even means. Every square is a rectangle but not every rectangle is a square. We can only call a figure a square if it has four sides all of equal length, and four right angles (each of 90 degrees) So, to square a rectangle is to build a square that has the same area (equal area) as the one of a given rectangle. Basically, we use the dimensions that are given in a rectangle and apply them to construct a square.

Now, here’s what you have to do to square the given rectangle:

  1. Start with a rectangle. You can draw one on paper or use an existing rectangular object. Note the lengths of the longer side (length) and the shorter side (width). Let’s call our rectangle ABCD, with AB and CD as the longer sides, and BC and AD as the shorter sides.
  2. Then, draw a line beyond point B along AB.
  3. Using a compass, draw an arc centered at B with a radius BC (the shorter side of the rectangle). Mark the intersection of this arc with the extended line as point E.
  4. After that, locate the midpoint M of the segment AE and construct a circle centered at this point M with a radius equal to half of AE (ME and AM).
  5. Draw a line beyond point C along BC. Let F be the point where this line intersects the circle.
  6. After everything is done, you can use BF as the side length to construct your new square.

Here are a few pictures to help you visualize the building process:

How to Square a Rectangle
Note that here, the naming of points is different from ours
How to Square a Rectangle
A visualization of our method of squaring a rectangle

Other Methods of Squaring a Rectangle

Squaring a rectangle might sound like an odd task at first, but in reality, it is a widely used concept, especially in construction works. Mostly, it is used specifically to make sure that the corners of the building are perfectly square, meaning they are all 90 degrees.

Construction workers though may not have all that time to draw everything like we did in the previous paragraph. That’s why they may use other methods to square a rectangle. For example a 3-4-5 technique. It’s a popular strategy that uses the Pythagorean theorem to make sure you build the right angles. By measuring 3 units on one side, 4 units on the adjacent side, and building the diagonal which equals 5 units, builders can create a perfect 90-degree angle. This method is scalable and can be adjusted for larger dimensions because here it’s not the numbers that matter but their correlation.

Another approach is the equal diagonal method, which involves measuring the diagonals of the proposed rectangle. If the diagonals are equal, the corners are therefore square. This method is simple and effective for structuring a correctly aligned foundation. Both techniques are necessary for achieving a perfectly square foundation, which is the basis for a sturdy and well-constructed building.


What is the formula to find the area of a rectangle?

The formula for finding the area of a rectangle is the product of its length and width. So, if you want to find an area for rectangle ABCD where AB and CD are length sides, and AD and BC are width sides you need to multiply AB by BC: Area (ABCD) = AB x BC.

How do you find the diagonal of a rectangle?

To find the diagonal of a rectangle, use the Pythagorean theorem: the square of the diagonal is equal to the sum of the squares of the length and width: c2= a2+ b2.

Can a rectangle be a square?

Yes, a rectangle can be a square if all its sides are of equal length and all angles are right angles.

What is the difference between a square and a rectangle?

The difference is that a square has all four sides of equal length and four right angles, while a rectangle only requires opposite sides to be equal in length and all angles to be right angles.


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