Must know about Triad which create Minor tones

All guitar players should know about Triad, because Triad is the basic tones forming a chord.
Basic triad consists of three tones.
For example:
D tone, F # tone and tone of A , creating a basic chord, referred to as D Minor
Another example:
C tone, D# tone and tone of G , creating a basic chord, referred to as C Minor
Look at the example images below!