All of these shapes are a square

So what gives? Basically, a roofer’s use of the term “square” means any area that represents 100 square feet. As a result, any shape that covers this area is considered a square by a roofer. Notice that I did not say all the above shapes were “squares”. This would be of course wrong, and I would need to go back to pre-k. I also did not make the mistake of telling you that a roofer’s square is a 10’x10′ area. This mistake is often made. Of course, a 10’x10′ area is a square, but so is an isosceles triangle ( a triangle with two equal sides and two equal angles) with a base of 20′ and a height of 10′, a parallelogram in which adjacent sides multiplied equal 100 and opposite sides are parallel, and a rectangle in which adjacent sides multiplied equal 100.