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Mathematics 21 Online
OpenStudy (anonymous):

PLEASE HELP - I'll post an image!

OpenStudy (anonymous):

OpenStudy (mertsj):

I answered this for you once this evening.

OpenStudy (anonymous):

DEF is same as BAC (proportionately), then DE must be proportionate to BA. That means, the scale of the two triangles is 2x. Find the other sides and then the perimeter.

OpenStudy (mertsj):

I would be easier to just add the three sides of the small triangle and multiply by 2. That would be the perimeter of the big triangle.

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