4 + (−6) = −10 + (−15) =

−5 + 12 =

8 + (−7) =

11 + (−11) =

−9 + (−11) =

3 + (−13) =

“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 .