This is the first placement of the Keyboard Edition of my Music Slide Rule. The tonic of the rule is on C of your piano, therefore, it demonstrates the notes of the C Major Scale and since the relative minor scale of C Major Scale is A Minor, which shares all the notes of C Major scale except that the tonic is on A. Please check with the back page of my JLaw's Music Side Rule on the definition of the Major Scales and Minor Scales and how they are related to each other.
