A minor chord derivation - Constructing form A minor and C major scales

The notes of the (natural) minor scale are, similarly, are at intervals of 2-1-2-2-1-2-2, i.e. (U,) M2, m3, P4, P5, m6, m7 and P8 (i.e. . 1-2-3b-4-5-6b-7b-8)– C minor scale will thus consists of the notes C, D, Eb, F, G, Ab, Bb, and c. The C minor chord is composed of the 1st 3rd and 5th notes of the C minor scale. The intervals are, thus, U, m3, P5 or 1-3b-5 (indicating the notes at unison-minor 3rd and perfect 5th intervals).

Now, let us have a look at the A minor scale. The A minor chord is, likewise, composed of the 1st 3rd and 5th notes of the A minor scale. If you have noted, C major and A-minor are relative keys, meaning that they have the same notes composing them; it’s just that A-minor scale can be written as the 6th degree of the C major scale. The notes of the a minor scale are, thus, A, B, C, D, E, F and G. Thus, the A-minor chord has the notes A, C and E. Thus A-minor chord belongs to both the C major scale, as well as the A-minor scale.
http://basicmusictheory.blogspot.com/2009/09/minor-chord-derivation-constructing.html

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A minor chord derivation - Constructing form A minor and C major scales