Can someone help? it is for a review for my test and i don’t understand

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  use the ASA postulate with alternate interior angles

Step-by-step explanation:

Congruence in general

For proving triangle congruence, there are basically 4 ways to do it. All require at least one side. They are ...

When applied to right triangles, the right angle counts as one of the angles, and two sides determine the third, so these can become the LL, HL, HA, LA theorems, where the letters (H, L, A) stand for (hypotenuse, leg, angle), respectively.

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Approach to this problem

Of course, you're familiar with the relationship between angles where a line crosses parallel lines. Those relationships can help you identify two congruent angles in each triangle. The fact that the triangles share a side between those angles gives you a clue that you will be using the ASA postulate for your proof.

Specifics

1. AB ║ CD and AD ║ BC . . . . given

2. ∠1≅∠3 . . . . alternate interior angles at a transversal of parallel lines are congruent

3. AD≅DA . . . . reflexive property of congruence

4. ∠2≅∠4 . . . . alternate interior angles at a transversal of parallel lines are congruent

5. ∆DAB ≅ ∆ADC . . . . ASA postulate

true

step-by-step explanation:

intersecting chords are just lines that intersect. so a line is equal to 180 degrees, so when it is intersected by another chord, then it create supplementary angles, and because the lines cross, vertical angels are also formed.