THE ELEMENTS O F EUCLI D. VIZ. 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 Demonstrations are restored. ROBERT SIMSON, M. D. Emeritus Profeffor of Mathematics in the University of Glasgow. To this FIFTH EDITION are also annexed, ELEMENTS of PLAIN and SPHERICAL TRIGONOMETRY, EDINBURGH Printed for J. NOURSE, London, and J. BALFOUR, Edinburgh, |