Hello! Please help me with the following drawing in Word:

http://imgur.com/iQgXs.jpg

But i need to make it like:

http://i.imgur.com/0iPyk.jpg

i.e., i need to resize the star autoshape in a specific way. But the problem is i don't know where do i make such changes to this autoshape automatically, because i have strict requirement for the size of the star, and this is the requirement:

http://i.imgur.com/QMfBw.jpg .

It means i know i can resize it in that manner moving that little yellow point on the star autoshape, but then i can't be sure it is 2,5 cm .

I have a russian version of MS Office 2007, but i would gladly accept recommendations about the english version.

Thank you very much in advance.