Set Height of rotated movie problem

I want to set the height of rotated movie.

says,

mc._rotation = 45; (rotate by AS, not in Flash Design interface)

I want to set the new height of the movieclip, says 100.
However, the height is just slightly decrease each time…

I think I am using a wrong method to do it.
How can I set the height of rotated movie?

Thanks in advanced. :ub:

p.s. Attached is my problem fla file.

oops… I am sorry that post this thread in this area… Thanks moderator helps me to transfer this thread into a right area… :slight_smile: