3,4,5 rule

Okay, you've got me - this is Pythagorus' theorum.... Really easy though! In a right angled triangle the square of the two smaller sides added together is the same as the square of the diagonal. To donate to the tecmath channel:https://paypal.me/tecmath To support tecmath on Patreon:   / tecmath   To buy tecmath mechandise: https://teespring.com/stores/tecmath-...