A Treatise on the Geometrical Representation of the Square Roots of Negative Quantities (Classic Reprint)

Excerpt from A Treatise on the Geometrical Representation of the Square Roots of Negative Quantities

Neither is there any quantity different in direction from d, which is a fourth proportional to a, b, c.

For since d is a fourth proportional to a, b, c; dis inclined at the same angle to c, which b is to a.

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