En el paralelo drama ABCD, la medida del ángulo A es 99'. Explica por qué la medida del ángulo adyacente B debe ser 81'

“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 .