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Every Thing that is Useful and Curious in that Art,

IS FULLY CONSIDERED AND EXPLAINED, PARTICULARLY

THREE NEW AND VERY CONCISE METHODS FOR.

DETERMINING THE AREAS OF RIGHT-LINED
FIGURES, ARITHMETICALLY OR BY CALCU-
LATION,

WELL AS THE GEOMETRICAL
ONES HERETOFORE TREATED OF.

AS

The whole illustrated with Copper-plates.

THE NINTH EDITION.
BY ROBERT GIBSON, TEACHER OF THE MATHEMATICS.

WITH ALTERATIONS AND AMENDMENTS,

ADAPTED TO THE USE OF AMERICAN SURVEYORS.

PHILADELPHIA:

RINTED BY JOSEPH CRUKSHANÍ,

1808,

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