Excerpt from A Treatise on the Geometrical Representation of the Square Roots of Negative QuantitiesNeither 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.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition.

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