Question

Please help. I can not figure out what the answer is for b=

Answer 1

Using the pythagorean theorem, we have, for right angled triangles,
leg1^2+leg2^2=hypotenuse^2

Applying to the current situation,
3^2+b^2=4^2
b^2=4^2-3^2=16-9=7
Therefore b=√7.