[c.math.hypot3]
29.7 Mathematical functions for floating-point types [c.math]
29.7.3 Three-dimensional hypotenuse [c.math.hypot3]
ð
constexpr floating-point-type hypot(floating-point-type x, floating-point-type y, floating-point-type z);
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Returns: âx2+y2+z2.