ALSO parallel to CD \[\{\text{as}\,AB|\,\,|CD\}\] \[4x=\angle A\] (CORRESPONDING angles) \[6x=\angle B\] (Corresponding angles) \[10x=\angle A+\angle B=130{}^\CIRC \] \[x=\frac{130{}^\circ }{10}=13{}^\circ \]