Find the long side (the hypotenuse) of a right triangle with the other sides 3 and 4, and with 5…

• With math.sqrt: $\sqrt{3^2 + 4^2} = \sqrt{25} = 5.0$.
• With math.hypot(5, 12): $\sqrt{25 + 144} = \sqrt{169} = 13.0$.

math.hypot does the squaring, the adding and the square root in one step.