Question

Angle CBD has a measure of 140°. What is the measure of angle ABD? 40° 50° 60° 70°

Answer 1

The measure of ABD is 40

Answer 2

The measure of angle ABD is
`40\°`

Explanation:

we know that

`m<CBD+m<ABD=180\°` -----> by supplementary angles

see the attached figure to better understand the problem

we have

`m<CBD=140\°`

substitute and solve for the angle ABD

`140\°+m<ABD=180\°`

`m<ABD=180\°-140\°=40\°`