"Solution" is written when solving equations and some geometric proofs. If there is "please explain why" or ". . . . ? "The word" solution "should be used. Write at the beginning of the certificate.

"From the meaning of the topic" is relatively loose, and some conditions on the topic can be omitted. At the beginning of the process, you can directly write "from the title" and then prove it.

As shown in the figure, what is the relationship between angle 2 and angle 3? (sketch, as long as it is in this format)

Solution:

Yes: vertex angle/complementary angle/complementary angle/. . . . . .

Something like that . . . .

If in the diagram, it is known that angle 2 and angle 1 are complementary, and angle 2 is equal to angle 3, which is 45 degrees, then what is the relationship between angle 4 and angle 1?

Judging from the meaning of the question:

Angle 2 equals angle 3.

So angle 3 and angle 1 are complementary.

So ... . .

I think so too. . . . .

I am tired of playing with my hands. . . . . . T^T