## baileymorgan one year ago What is the argument of -5i? I have been stuck on this for a while!

1. SolomonZelman

argument of -5i ?

2. baileymorgan

Yes.

3. SolomonZelman

I haven't ever heard of such a concept in math -:(

4. baileymorgan

Okay :(

5. satellite73

argument i think is the same as the angle, yes?

6. myininaya

http://www.mathcentre.ac.uk/resources/sigma%20complex%20number%20leaflets/sigma-complex9-2009-1.pdf It is defined here in this link.

7. satellite73

|dw:1401672180125:dw|

8. satellite73

wow a celebrity! hello!!

9. satellite73

you can see what the angle is directly from the picture you have lots of choices because it is not unique

10. baileymorgan

I still really don't understand it. Could you explain it to me please in more depth?

11. myininaya

you need to find the angle between the initial ray and the terminal ray that is find this angle: |dw:1401679079632:dw|

12. baileymorgan

Okay...I still don't know how to exactly get the answer though. It is confusing for me.

13. myininaya

you know that is a right angle?|dw:1401680681402:dw|

14. baileymorgan

Is the argument 3pi/2 then?

15. myininaya

the argument is simply the measurement of the angle between the initial ray in the terminating one you could say 270 degrees or even -90 degrees And of course you can use radians to describe the measurement of the angle