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CodedEmerald

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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