Complex numbers: modulus and argument
Change the real and imaginary parts to see the modulus, argument and polar form.
Learn complex numbers properly
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Questions students ask
What is the modulus of a complex number?
Its distance from the origin on the Argand diagram, √(a² + b²).
What formula does it use?
|z| = √(a² + b²); arg z = atan2(b, a); z = r(cos θ + i sin θ).
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