Calculating Moment about a Point: Understanding FDCsin and FDCcos

[chetzread]

1. The problem sttatement, all variables and given/known data
i don't understand the moment FDC(sin18.43)(9) , I think it's wrong..
http://imgur.com/a/qPdqf

Homework Equations

The Attempt at a Solution

I think it should be FDC(cos18.43)(3), am i right?
the r is the perpedicular distance from D to force FDC, i have circled it...
Or I'm wrong? FDCsin18.43)(9) represent other moment?

 

[chetzread]

sorry, photo here

 

[chetzread]

there' also moment caused by other forces such as 2KN at B , why didnt the author consider that? the 2kN force can cause moment about I ,right?

 

[chetzread]

is the author wrong ?