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Modulus Of Complex Number Calculator . Hence i 4n+1 = i; This representation uses the magnitude (modulus) r of a vector starting at the origin and ending in the complex point z, and the angle φ between this vector and the positive real axis measured in a clockwise direction. Modulus Of Imaginary Number Calculator IMAGECROT from imagecrot.blogspot.com As an imaginary unit, use i or j (in electrical engineering), which satisfies the basic equation i2 = −1 or j2 = −1. What is a complex number? Sum = square of real part + square of imaginary part = x 2 + y 2.