Answer:

The second question:

Answer:

This part of the extended information mainly examines the knowledge points at the corners:

AAS is the corner edge. Given the opposite sides of two corners corresponding to two triangles and one of them, are the two triangles congruent? Or know the opposite sides of two angles and one of them, and ask if this triangle is unique. First, two angles are known, and the degree of the third angle can also be calculated, and then the triangle congruence can be proved according to ASA.

The proof method is as follows:

∫ Known ∠A∠B∠A+∠b+∠C = 180.

I know C.

∵∠∠∠∠∠∠∠∠∠∠∠∠∠,

So the triangle is unique (ASA).

In AAS,

Given two angles of AA, it can be proved that the remaining one is equal according to the sum of the internal angles of the triangle is equal to 180.

Then because ASA can prove the congruence of triangles,

So AAS can also prove that triangles are congruent.