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Math seven times. . Adjoint parallelism
Because the vertical foot c is 90, ∠1+∠ 2 = 90.

Think again, if AB∨CD, then ∠ 1 and ∠BAC are internal angles, that is ∠ 1=∠2.

The sum of the interior angles of the triangle is 180, because ∠ 1=∠2, then ∠ BAC+∠ 1+∠2 = 180, so it holds (∠. .

I don't understand.

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