Figure ABCDE was reflected across the line y = r to
create figure A B C D'E. What are the coordinates of
the pre-image of E?

“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 .