From QB64.org wiki
The _HYPOT function returns the hypotenuse of a right-angled triangle whose legs are x and y.
- result! = _HYPOT(x, y)
- x and y are the floating point values corresponding to the legs of a right-angled (90 degree) triangle for which the hypotenuse is computed.
- The function returns what would be the square root of the sum of the squares of x and y (as per the Pythagorean theorem).
- The hypotenuse is the longest side between the two 90 degree angle sides
3 , 4 and 5 form a right-angled triangle.
- ATN (arctangent)
- _PI (function)
- Mathematical Operations
- C++ reference for hypot() - source of the text and sample above