Additional questions: known: as shown in the figure ∠ 1 = ∠ 2, ∠ C = ∠ D, try to explore whether ∠ A and ∠ f are equal? Try to explain the reason

The reasons are as follows: ∵ 1 = ∵ 2, ∵ 1 = ∵ DGH, ∵ 2 = ∵ DGH, ∵ BD ‖ CE, ∵ C = ∵ ABG, and ∵ C = ∵ D, ∵ ABG = ∵ D,

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