# How do you use the pythagorean theorem?

Nov 6, 2014

Pythagorean theorem: ${a}^{2} + {b}^{2} = {c}^{2}$

This only applies to right angle triangles (one of the angles is ${90}^{\circ}$s)

If you want to find the length of a triangle where it's A=3 B=4 C=?

you do 3^2+4^2=?

$9 + 16 = 25$

and

${5}^{2} = 25$

Therefore

C=5

you can also use it to find A or B by doing ${C}^{2} - {A}^{2} = {B}^{2}$ or ${C}^{2} - {B}^{2} = {A}^{2}$