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This is part of a homework question

I'm trying to figure out the perimeter of the black-filled object below (sorry, it's crudely drawn in paint, but I think you get the idea). To find the perimeter, I'm assuming that I should first find the perimeter of the rectangle (12*2+3*2 in this case) then subtract each little triangle (which is suppose to be all the same size by the way). The question mentions only one fact other than the size of each side- that it's trisected. I'm pretty sure the answer to this question lies in here...

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    @Issac- Thanks, I have already arrived at each answer. I guess what I should of set is subtract the hypotenuse of each small triangle.2010-10-12

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Well, if each side is trisected, that means it's split into three identical parts. The base of each triangle is one of the parts of the 12 side, and the height of each triangle is one of the parts of the 3 side. You can figure it out from there.

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    That solves my question, thanks! What threw me off is the image I was given isn't drawn to scale. And I forgot that bisect means dividing something into two _equal_ parts...2010-10-11