Answer:
In triangle EFD:∡F + ∡D + ∡E = 180
In triangle TRS:∡T + ∡R + ∡S = 180
∡F = ∡R and ∡D = ∡S, so ∡E = ∡T
We've got 2nd triangle congruence property(2 angles and a side between them; ∡E = ∡T; ∡F = ∡R; EF = TR)
ΔEFD = ΔTRS
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