Triangle abc has been dilated to form triangle a'b'c'. if sides ab and a'b' are proportional, what is the least amount of additional information needed to determine if the two triangles are similar?

for me what is finding a good play list and going out because i can not lay down and relax so i usually go to a coffee shop. i also use the gum trick and this actually works. another advice is highlighting subjects it really does me remember certain things

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