Ihave been stuck with this one, and i would like to how to solve this.
in each case, determine whether line ab is parallel or perpendicular to cd.
(a) a(0, 0), b(0, 1), c(0, 0), d(1, 0).
(b) a(0, 1), b(2, 3), c(4, 5), d(6, 7).

it's both, now can you answer my most recent question?

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