Converting Complex Numbers from Cartesian to Polar Form

Complex numbers can be expressed either in Cartesian form (z = x + iy) or in polar form ( z = r*cisθ ), wherever the situation is convenient.
In this video, I demonstrate how to convert a complex number from its Cartesian form to its polar form.
This is done simply by plotting the complex number as a point on the Argand plane, and then drawing a vector from the origin to that point. The angle that the vector makes with the horizontal real axis is the angle θ.
The magnitude of the vector |z| determines r.
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