Question

How do you convert the rectangular point `(0,-5)` into polar form?

Answer 1

Rectangular `(0,-5)` = Polar `(5,(3pi)/2)`

Explanation:

The (rectangular) point `(0,-5)` is on the negative Y-axis;
as such it's angle is `(3pi)/2`
and it is a distance of `abs(-5)=5` from the origin
so its radius is `5`