As shown in the figure, in △ ABC, ∠ a = 70 ° bisector CE ‖ ab of outer angle, calculate the degree of ∠ B and ∠ ACB

As shown in the figure, in △ ABC, ∠ a = 70 ° bisector CE ‖ ab of outer angle, calculate the degree of ∠ B and ∠ ACB

∵ CE ‖ AB, ∵ DCE = ∠ a = 70 ° and ∵ CE bisection ∠ DCB, ∵ B = ∠ ECB = 70 °, ACB = 180 ° - DCB = 40 °