The complementary color of a red-violet focal point is

The complementary color of a red-violet focal point is green yellow.

Explanation:

Complementary colors are those that are located at the opposite end of the color wheel and therefore complement each other.   The chromatic circle is observed in the attached image.

The primary colors are those that cannot be obtained by mixing other shades, being considered unique. The 3 primary colors are blue, yellow, and red.

The secondary colors, in turn, are obtained from the mixture of two primary colors, being orange, green and violet.

Tertiary colors, on the other hand, are obtained when we mix equal parts of a primary and a secondary color, resulting in the following shades: greenish yellow, greenish blue, violet blue, violet red, orange red and orange yellow.

The complement of a primary color will always be a secondary one, and vice versa. In the case of tertiary colors, three pairs of complements are observed in the color wheel:

Finally, the complementary color of a red-violet focal point is green yellow.

50 inches should be the resultant vector