
- Imaginary Number


If a one-dimensional vector rotates +90 degrees and rotates +90 degrees once more, the result can be -1.

- Complex Number

If a number is not expressed as a single number such as 1, 2, or 3 but as a field composed of several units, it is called a complex number, x is called the real part, and y is called the imaginary part.
For example, the equation

has no real solution, because the square of a real number cannot be negative.
The ways of Complex Number expression.
1. Cartesian coordinate
A coordinate system that specifies each point uniquely by a pair of real numbers called coordinates, which are the signed distances to the point from two fixed perpendicular oriented lines

2. Polar Coordinate
Express using the distance from the origin and the angle from the horizontal axis.


For example, let's calculate the distance and the degree of this.
https://angeloyeo.github.io/2019/06/15/imaginary_number.html
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