Iam stuck on this question d:scuba divers count fin strokes to estimate the distance they have travelled under water. felipe uses this method and a compass to swim 300 m north from the dive boat. he then turns right 120° and swims 400 m. how far from the boat is he, to the nearest metre? in what direction must felipe swim to return to the boat?

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