Coordinates of triangle DEF are D(-1,4) E(7,-3) F(9,5). Translate to get centroid of triangle Dprime Eprime Fprime at (-6,2) and write the rule.

Ithink the answer is b

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .