ELEMENTS

OF

GEOMETRY:

CONTAINING

THE FIRST SIX BOOKS OF EUCLID,

WITH A

SUPPLEMENT

ON THE

QUADRATURE OF THE CIRCLE, AND THE
GEOMETRY OF SOLIDS:

TO WHICH ARE ADDED,

ELEMENTS OF PLANE AND SPHERICALE
TRIGONOMETRY.

BY

JOHN PLAYFAIR, F.R.S. LOND. & EDIN,

PROFESSOR OF NATURAL PHILOSOPHY, FORMERLY OF MATHEMATICS, IN THE
UNIVERSITY OF EDINBURGH.

FROM THE LAST LONDON Edition, enlarged..

AD

PHILADELPHIA:

J. B. LIPPINCOTT & CO.

1866.

Entered according to the Act of Congress, in the year One Thousand Eight Hundred and Forty-five, by W. E. DEAN, in the Clerk's Of fice of the Southern District of New-York.