The answer to your question is C
First we need to find the length. So we do 126/3 to get 42. The length is 42. Now to find perimeter we do 2(42)+2(3) or 42+42+3+3.
Both ways are right ways. The perimeter is 90 meters.
Hope that helps!!
(2) diagonal are congruent
What do you need to finish
B, because it has no equal, greater than, or less to sign