Watch the A Chords online guitar lesson by Joe Dalton from Fretboard Epiphanies
Now we have the same thing in the Key of A. Use your knowledge of scales to put this one together. It may take some time, but you'll find the work very rewarding. The second set of chords uses an E bass. These are still "A" chords. They are in second inversion because there is an "E" in the bass The third set has a "D" in the bass. These are D major ninth chords.