"I'm not sure how to prove it.." You're not sure or you don't know?
Indication: Use The Fundamental Theorem of Similarity and/ or Thales' Theorem.
Lines l1 and l2 intersect each other and 3 parallel lines, l3, l4, and l5, at the points shown below. The ratio of the perimeter of triangle ABC to the perimeter of triangle AFG is 1:3. The ratio of DE to FG is 2:3. What is the ratio of AC to CE?
I know that answer is 1:1 but I'm not sure how to prove it..
"Indication: Use The Fundamental Theorem of Similarity and/ or Thales' Theorem." Remember that?
"The ratio of the perimeter of triangle ABC to the perimeter of triangle AFG is 1:3. The ratio of DE to FG is 2:3." This is what you know, use it and The Fundamental Theorem of Similarity for two conveniently chosen triangles. After that thinghs should be clear.
Sooo... you're waiting for someone to solve your problem and refuse to think, nice, very nice -_-
"how to relate it to this problem" You sure know that theorems?
"Lines l1 and l2 intersect each other and 3 parallel lines, l3, l4, and l5, at the points shown below."
Hi Sarahh.
Draw a triangle ABC with a base BC Mark the midpoints of AB and AC m and n. Draw a line mn. Measure the perimeters of the two triangles . Compare all ratios of the sides of both triangles. Then repeat the procedure with your diagram but with the given perimeters or other info
bjh