Solve the equation if 0(o) < x < 360(o) cos x = -1/2

Cos(x) = -1/2
x = arccos(-1/2) = 120° or 240°

“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 .