# Thread: Confused on this problem

1. ## Confused on this problem

In this parallelogram, the measure of Angle B exceeds the measure of Angle A by 30 degrees. What is the measure of Angle D?

Can anyone explain how I find this? I have several other problems that are similar to t
his.

2. use the fact that A and B are supplementary ...

A + B = 180

B = A + 30

finish up

3. So A = 90 and B = 90?

4. Originally Posted by Marc9118
So A = 90 and B = 90?
no

adjacent angles of a parallelogram are supplementary ... this tells you that

A + B = 180 (this does not mean A = B)

you were also told that B was 30 degrees bigger than A ...

B = A + 30

substitute (A+30) for B in the first equation ...

A + (A + 30) = 180

now, solve for A , then calculate B.