Linked from
The 9 pages that link to Complex modulus, each with the reason it gives.
Complex numberRelated: The modulus measures the magnitude of a + bi as √(a² + b²).
Complex planeRelated: It measures the distance of a represented point from the origin.
Polar formBroader topic: It supplies the magnitude r in the polar representation.
Magnitude (mathematics)Broader topic: It computes complex magnitude as distance from zero.