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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, AS WELL AS THE GEOMETRICAL

ONES HERETOFORE TREATED OF.

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:

PRINTED BY JOSEPH CRUKSHANK

1808.

45 45 308

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