THE

THE ERRORS BY WHICH THEON OR OTHERS HAVE LONG AGO
VITIATED THESE BOOKS, ARE CORRECTED,

And some of Euclid's Demonftrations are reftored.

ALSO

THE BOOK OF

Euclid's Data,

IN LIKE MANNER CORRECTED.

BY ROBERT SIMSON, M. D.

EMERITIS PROFESSOR OF MATHEMATICS IN THE UNIVERSITY OF GLASGOW.

To this TENTH EDITION are allo annexed,

Elements of Plain and Spherical Trigonometry.

Dublin:

Printed by P. WOGAN, No. 23, Old-Bridge.

1803.