Answer:
The measure of angle ABD is [tex]40\°[/tex]
Step-by-step explanation:
we know that
[tex]m<CBD+m<ABD=180\°[/tex] -----> by supplementary angles
see the attached figure to better understand the problem
we have
[tex]m<CBD=140\°[/tex]
substitute and solve for the angle ABD
[tex]140\°+m<ABD=180\°[/tex]
[tex]m<ABD=180\°-140\°=40\°[/tex]
