I NEED HELP PLEASE! THANKS :)

A

Step-by-step explanation:

First, let's do the difference of two squares:

Note that (Pythagorean Identity)

Thus, we can substitute:

Now, and I'm serious, you just have to use your creativity. After a while, you will find that:

So:

Thus, we have

Now, we can substitute:

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer