Question

In figure AB EF and CD are Parallel Lines given that AB = 15 EG = 5 cm GC = 10 cm and DC = 18 cm calculate EF and AC​


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Answer 1

Answer:

Using a construction in Cinderella, I get EF=9 and AC=25.

For the former, observe that △CDG is similar to △EFG. For the latter, consider △CEF and △CAB which are similar to one another as well. So with the EF you got before, and knowing CE, you get AC.