Pythagorean theorem
Pythagorean theorem is something I learned over this 1st part of math this year. It is used in our every day life all the time. For example if you are making a square barn you can measure the sides and the square them and add them. Once you do that then you do the square root of them bot and then that is how long it is from one corner to the other. Then you can know that is fur sure the right size and will be a perfect square. This is very helpful.
