Geometry Help please

I can't figure how to get the missing sides, AC and DF. I need to find the perimeter, but I don't understand how to. Could someone explain how I get the missing sides?

Question

Geometry Help please

I can't figure how to get the missing sides, AC and DF. I need to find the perimeter, but I don't understand how to. Could someone explain how I get the missing sides?

anonymous · Answer

attachment

anonymous · Answer

The triangles are similar divide the sides of ABC by 4 to get the sides of DEF. Also, they are isosceles so AB = AC and DE = DF

anonymous · Answer

I mean I get that that's how I would potentially get all of the sides and that AC = DF, but I'm not given a side length for either of those. I can figure out the other side lengths by multiplying/ dividing, just not that one. Is there a way to get that side that I'm just not remembering right now?

anonymous · Answer

you have AB = 49. that means AC = 49. Divide 49/4 to get DF and DE.
You also have EF = 7.5. Multiply 7.5*4 to get BC.