(section 1.3) use the following matrices to compute the indicated expression if it is defined. 4. 1 4 -1 1 1 ,c= ,d=1-1 0 11. 13(4) 4

“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 .