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OF

G E O M E T R Y:

TRY

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 SPHERICAL

TRIGONOMETRY.

BY

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

PROFESSOR OF NATURAL PHILOSOPHY, FORMERLY OF MATHEMATICS, IN THB

UNIVERSITY OF EDINBURGH.

A NEW EDITION, ENTIRELY REMODELLED,

BY JAMES RYAN,
AUTHOR OF AN ELEMENTARY TREATISE ON ALGEBRA, THEORETICAL AND PRACTICAL ; THÉ
DIFFERENTIAL AND INTEGRAL CALCULUS; THE NEW AMERICAN

GRAMMAR OF ASTRONOMY, &c.

NEW YORK:
W. E. DEAN, PRINTER AND PUBLISHER, 32 ANN-STREET.
N. & J. WHITE; COLLINS & HANNAY; J. B. COLLINS ;
JAMES RYAN; ROE LOCKWOOD; AND

LEAVITT, LORD, & co.

1835.