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Prove that figure ABCD is similar to figure AEFD
∠ABC = ∠BEF (Corresponding angles)
∠BCD = ∠EFD (Corresponding angles)
∠BAD = ∠BAD (Common angles)
∠ADC = ∠ADC (Common angles)
Therefore figure ABCD is similar to figure AEFD
By formula:
Therefore:
Answer: EF = 3.5
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