Name the similar triangles
O AABC - ADET
OLABC - AEDF
AABC-ADFE
AABC - FED

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Answer:
(d) ΔABC ~ ΔFED
Step-by-step explanation:
All of the answer choices start with ΔABC, so the first-named vertex is the one with no angle marking. In the smaller triangle, that is vertex F.
Only one answer choice matches vertex A with vertex F:
ΔABC ~ ΔFED