# Complex Numbers

#### sweeper

##### New member
Complex numbers
If z=rcis(theta) FIND: |iz^2|
I am confused about how I incorporate the i into the absolute value. I can't remember what it means. Please help and show exactly how I complete the workings. I can easily find the absolute value of z^2 I just really don't understand how to put the i into it.
Thank you!!

#### Evgeny.Makarov

##### Well-known member
MHB Math Scholar
Hi, and welcome to the forum.

You should use the identity $|z_1z_2|=|z_1|\cdot|z_2|$. For the rest, please see this section on Wikipedia.

#### HallsofIvy

##### Well-known member
MHB Math Helper
The absolute value of i is 1!