Hey there!
The answer is √20 or approximately 4.47
We can use the Pythagoreon Theorem, which is
.
and
are the names of the two sides, and
is the name of the hypotenuse leg, or the longest side. We will plug the numbers into the formula, and solve:
![2^2+4^2=c^2\\4+16=c^2\\20=c^2\\4.47...=c](https://img.qammunity.org/2022/formulas/mathematics/college/4yc2gvezsy6456dj9up79ngbks67srey24.png)
Have a terrifcly amazing day!