Question

What's the lenght of side b in the figure below

Answer 1

Let's use Pythagorean theorem.
`a^(2)+b^(2)=c^(2)` where
`c` is the hypotenuse.

So if we set it up:


`7^(2)+b^(2)=13^(2)`

now we simplify:


`49+b^(2)=169`

and get
`b^(2)` by itself:


`b^(2)=120`

Now to get
`b` by itself, we need to take the square root of both sides:


`b=√(120)`

And that's your answer!