In this problem
You have a triangle with 3 sides labeled A, R, O and 3 vertices labeled J, K, E.
To name a triangle, what you do is simply list all of its vertices.
The order doesn't matter.
So
let's take a look at all the possible choices.
A. EJR - Nope.E and J are OK. But R is the line segment.
B. KE - Nope. K and E is OK, but Only has 2 of the vertices.
C. JE - Nope. J and E is OK, but Only has 2 of the vertices.
D. KEJ - Yes. All three vertices have been named. This is an acceptable name for the triangle.
E. JAOE - Nope. Only has 2 of the vertices and A and O are line segments
F. JKE - Yes. All three vertices have been named. This is an acceptable name for the triangle.
therefore
the answer is
KEJ and JKE
