How to do multiple-choice questions 1-2? Tell me why.

1. Choose B, two angles are parallel, there is only one possibility, * * * use one side and the other side is parallel.

Then these two angles are internal angles on the same side, which add up to 180 degrees, and the other angle is 3 times 36 degrees smaller than the other angle, so choose B.

2. choose a, as shown in the figure, and make parallel lines of AB through point C.

Divide ∠2 into two angles, the upper part is ∠2 1 and the lower part is ∠22.

∠ 1+∠2 1= 180

∠3=∠22

∠ 1+∠2-∠3=∠ 1+∠2 1+∠22-∠3=∠ 1+∠2 1= 180

So choose one