A bit of math and two popup buttons

Question

HI
got this wee script that im trying to knock up, in AS Studio, the idea for it
is to have two popup buttons both would have specific numbers in them,
ie: "theDiam", would have say 64, 72 etc etc, and "theNum" would have 2, 3, 4 etc etc,
and a text field that would display the result.
It needs to have the number from the popup button "theDiam" multiplied by pye then that
result needs to be divided by the number from popup button "theNum", that result in turn
needs to be displayed in the text field "myDist".
Cant seem to get it quite right, the result I get back is:
Can't make contents of «class texF» "myDist" of window "main" of window "main" into type reference. (-1700)
So I presume from this that either ive set the text field area up wrong, or the script isnt
quite right.
on clicked theObject
if name of theObject is "info" then
tell window "main"
set _Amount to name of current menu item of popup button "theNum" as number
set _origNum to name of current menu item of popup button "theDiam" as number
set _newNum to (_origNum) as number
set _newNum to (_newNum * 3.1416) as number
set _finalResult to (_newNum / (_Amount)) as number
set contents of text field "myDist" of window "main" to _finalResult as text
end tell
end if
end clicked
Budgie

Answer 1

Hey Cyclosaurus
thanks for the "pi" tip, (i must learn how to spell properly , added your suggestion, it did not work, at first, the result errored and showed:
Can't make contents of «class texF» "myDist" of window "main" of window "main" into type reference. (-1700)
problem two "window mains", so I removed:
set contents of text field "myDist" of window "main" to _finalResult as text
and replaced with
set contents of text field "myDist" to _finalResult as text
and all is perfect, appreciate the pointers
Budgie