# What is the polar form of #( -4,5 )#?

##### 1 Answer

The polar form of (-4,5) has

#### Explanation:

You can use Pythagoras theorem or the complex numbers. I'm gonna use the complex numbers because it is simpler to write down and to explain as I always do that and english is not my mother language.

By identifying

We now need the argument of this complex number. We know its module, so we can write that

We know that when we factorize by the module, we get the cosine and the sine of a real number. It means that