# how might the Pythagorean theorem be used in everyday life?

I just used it last summer while helping to build a deck. We wanted to check whether two pieces of wood made a right angle so we made a pencil mark 3 feet from the corner on one board, 4 feet from the corner on the other, and then we measured the distance between the two pencil marks. It was almost exactly 5 feet, so we knew we had a nice right angle!

Actually, if you want to get technical, we used the converse of the Pythagorean Theorem, which tells us that if we have a triangle with side lengths 3, 4, and 5, it must be a right angle. Close enough though.

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The Pythagorean theorem can be a very great help in finding the distance between two specigfic locations using the distance formula such that:

`D^2 = (x_A - x_B)^2 + (y_A - y_B)^2`

`x_A, y_A`  represents the x and y coordinates of the location A

`x_B, y_B`  represents the x and y coordinates of the location B

D represents the distance between locations A and B

You may also use Pythagorean theorem to evaluate the diagonal of your laptop screen.

Hence, these are just some of the many examples where Pythagorean theorem is of great help.