Question

M/ABC = 40°and BD is the angle

bisector of ZABC
B
3x-1
34-2x
A
3y+6
D
5y-18
m/ABD = [? ]°

Answer 1

∠ ABD = 20°

Explanation:

since BD is the angle bisector of ∠ ABC , then

∠ ABD = ∠ CBD , so

∠ ABD =
`(1)/(2)` × ∠ ABC =
`(1)/(2)` × 40° = 20°