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What's the relationship between aad and bc in the math problem of senior two?
∵AD⊥BC,EF⊥BC

∴AD‖EF

∴∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠873

∠∠3 =∠C

∴AC‖GD

∴∠ 2 =∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠

∵∠ 1=∠4 ∠2=∠4

∴∠ 1=∠2

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