suppose you have ABC with AB=5, BC=7, and CA=10, and also EFG with EF=900, FG=1260, and GE=18/00. are these triangles…

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suppose you have ABC with AB=5, BC=7, and CA=10, and also EFG with EF=900, FG=1260, and GE=18/00. are these triangles similar, and if so what is the scale factor?