Help? :)

[Bordersalsaverde]

Q:If AB ⊥ CB and m∠D = 130, what is the measure of ∠A?

A. 50°
B. 40°
C. 130°
D. 70°

Directions: In the figure above, CD || AB.

I'm not sure how to go about these. Can anyone explain?

 

[tkhunny]

\(\displaystyle CD\)\(\displaystyle \perp CB\)

 

[lookagain]

View attachment 2704

Q:If AB ⊥ CB This is extra information. It isn't necessary to solve the problem.


and m∠D = 130,


what is the measure of ∠A?

A. 50°
B. 40°
C. 130°
D. 70°

Directions: In the figure above, CD || AB. This info is crucial, though.

I'm not sure how to go about these. Can anyone explain?

AD is a transveral that cuts the parallel lines CD & AB.

What does that mean for the relationship between angle D and angle A

 

[Deleted member 4993]

View attachment 2704
Q:If AB ⊥ CB and m∠D = 130, what is the measure of ∠A?

A. 50°
B. 40°
C. 130°
D. 70°

Directions: In the figure above, CD || AB.

I'm not sure how to go about these. Can anyone explain?

m∠D = 130

m∠C = 90

m∠B = 90 ............................ and

m∠C + m∠B + m∠D + m∠A = 360

continue......