Fig. 1: D Major Scale
Fig. 2: Triads Built From The D Major Scale
1.) D Major
2.) E minor
3.) G Flat minor
4.) G Major
5.) A Major
6.) B minor
7.) D Flat dim.
Fig. 3: Example
Here is a sample progression built from the D major scale/chord system on this page.
D – Em – G – D – D – Em – G – A – D