In the diagram shown, lines m and n are parallel and crossed by transversal line r. This creates an angle that measures 135º as
shown. If the measure of Z1 is given by the expression 4x – 3 then
solve for the value of x.

“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 .

Were is the diagram?