Find the missing length of the triangle.
20 km
21 km
WHAT IS “C” PLEASE HELP

C=29

Step-by-step explanation:

a^2 + b^2 = c^2

21^2 + 20^2 = c^2

441 + 400 = c^2

841 = c^2

\sqrt(841) = \squrt(c^2)

29 = c

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