Jacked used the place

“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 .

For the first question the answer is a, for the second c, for the third d, for the 4th b, for the 5th a