Help! I have no idea what I'm doing..​

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.

180°

step-by-step explanation:

sum of equilateral triangle=180°

< n=60°

< m=120°°[angle supplementary of equilateral angle]

< m+< r+< x=360°(sum of exterior angle of triangle)

the answer is: -22 also a

hope i

-lavira: )

true

step-by-step explanation:

it is more then likely a review to you prepare for an upcomign test or quiz