QUADRATURE OF THE CIRCLE AND THE
GEOMETRY OF SOLIDS;

TO WHICH ARE ADDED,

ELEMENTS OF PLANE and spheERICAL,
TRIGONOMETRY.

BY

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

LATE PROFESSOR OF NATURAL PHILOSOPHY, (FORMERLY OF MATHEMATICS),
IN THE UNIVERSITY OF EDINBURGH, SECRETARY OF THE ROYAL SOCIETY
OF EDINBURGH, MEMBER OF THE ROYAL ACADEMY OF NAPLES, AND OF
THE ROYAL MEDICAL AND PHYSICAL SOCIETIES OF EDINBurgh.

SIXTH EDITION, ENLARGED.

EDINBURGH:

PRINTED FOR BELL & BRADFUTE; AND STIRLING & SLADE
EDINBURGH; LONGMAN, HURST, REES, ORME & BROWN;
OGLE, DUNCAN & CO.; AND G. & W. B. WHITTAKER,

LONDON.