Library /sys$common/syshlp/helplib.hlb  —  CRTL  hypot  Description
    The hypot functions return the length of the hypotenuse of a
    right triangle, where x and y represent the perpendicular sides
    of the triangle. The length is calculated as:

    sqrt(x2 + y2)

    On overflow, the return value is undefined, and errno is set to
    ERANGE.
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