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Junior high school mathematics: acute angle trigonometric function
The intersection of BD and AC is O. According to the meaning of the question, BOC and BOA are congruent triangles, so the arithmetic square root of ∠BAC=∠BCA, BC=2, 3 is ∠ BCD = 60. Because AB is parallel to CD, ∠BAC=∠DCA, ∠.

So BC is parallel to AD and ABCD is parallel to parallelogram.