[mathematical proof problem] as shown in the figure, in △ ABC, ab = AC, ∠ a = 36 °, BD is the angular bisector of ∠ ABC Mathematical proof As shown in the figure, △ ABC, ab = AC, ∠ a = 36 °, BD is the angular bisector of ∠ ABC

[mathematical proof problem] as shown in the figure, in △ ABC, ab = AC, ∠ a = 36 °, BD is the angular bisector of ∠ ABC Mathematical proof As shown in the figure, △ ABC, ab = AC, ∠ a = 36 °, BD is the angular bisector of ∠ ABC

∵ AB = AC ∵ ABC = ∵ C ∵ a + ∵ ABC + ∵ C = 180 & nbsp; & nbsp; & nbsp; ∵ a = 36 ∵ ABC = 72 ∵ BD is the angular bisector of ∵ ABC ∵ DBC = ∵ ABC / 2 & nbsp; & nbsp; ∵ DBC = 36 ∫ a = ∫ DBC in △ DCB and △ BCA ∫ a = ∫ DBC ∫ C = ∫ C ∫ DCB ∫ BCA ∫ DC / BC = BC / Ca