**Polar Form of a Complex Number**

The polar coordinates of a complex number on the complex plane. The polar form of a complex number is written in any of the following forms: *r*cos θ + *ir*sin θ, *r*(cos θ + *i*sin θ), or *r*cis θ. In any of these forms *r * is calledthe modulus or absolute value. θ is called the argument.

**See also**

cis, cosine, sine, complex number formulas, De Moivre’s theorem, polar-rectangular conversion formulas

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