making enemies fire when player is in range

[rsugar]

I cant find any tutorials anywhere that show how to find distance to an object.
ex. i want a "turret" or "tank" to not fire until my"helicopter" is in range"
im in 8th grade and my school doesnt offer trig... :(.
could someone please give me an example or a piece of code and explain it to me?
thnx

[Prancer]

I believe this should do the trick Rsugar:
Link (http://www.kirupa.com/developer/actionscript/calculating_distance.htm) :thumb:

[rsugar]

THanks!:smile:

[nathan99]

or u could jus basically use something like if the turret is at a certain X position it would fire.... seems to be the easiest option t me