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ELEM E N T S
EUCL I D.
THE FIRST SIX BOOKS,
TOGETHER WITH THE
ELEVENTH AND TWELFTH.
The Errors, by which THEON, or others, have long ago
And fome of EUCLID'S Demonftrations are reftored.
THE BOOK OF
In like manner corrected.
ROBERT SIMSON, M. D.
meritus Profeffor of Mathematics in the University of Glasgow.
To this SIXTH EDITION are also annexed,
LEMENTS of PLAIN and SPHERICAL TRIGONOMETRY.
rinted for J. NOURSE, London, and J. BALFOUR, Edinburgh.