Respuesta :

First exercise:

HI = EF

Second exercise:

Seems they are two isosceles triangle so NO = QR

Third exercise:

First triangles can be proved with SSS, they have three congruent sides
Second triangles are two right triangles attached to form an isoscles triangle and the angle at the base is supplementary (height is also bisector).

I think fourth option is the answer.

Fourth exercise:

I think the third triangle
First question:
HI = EF would tell us that the triangle is congruent through SAS.
The answer is the first choice.

Second question:
If angle O was the same as angle S, the two triangles would be congruent through SAS.
The last choice is the answer.

Third question:
The first choice is congruent by SSS, so eliminate it.
The second choice is congruent by SAS, making it your answer.
The shared side by the two triangles has to be congruent.
You don't have to look at any more of the answer choices.
The second choice is your answer.

Fourth question:
The third choice is the answer.
Three congruent sides means congruence by SSS.

Have an awesome day! :)
If you want to know exactly was SAS is, it's where you have two sides that are congruent with the same angle between the two sides.