Every day application of Pythagoras theorem?

1. A practical application of Pythagoras Theorem is to check where the ploat or a building or land are in the form of a square or rectangle ( i.e. each corner angle is 90 degree or not )

2. For finding the third side of a right angle triangle

3. Use of Trigometry i.e. sinx , cosx and tanx based on right angle triangle are used in finding the area of many geometrical figures like area of any triangle , rectangle etc.

4. many more ........