Use on real life

The Pythagorean theorem can be used on many ways and jobs. First of all as a mathematician is a basic skill to know how to use in all the possible ways the Pythagoras theorem. also by being an architect or in engineering you have to know it because for finding many measures in a plane or in a construction for finding measures needed when you don't have a ruler and you have some few measures it will make you find them. but the "most important" reason of why you have to know it? is simply to pass the exam as a student in any school; and for many more things is use full. So its better to take some time to understand and learn it,not because your teacher sais, but because its simple and its worth learning it for any job!