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ELEVENTH AND TWELFTH.
- -
THE ERRORS,
By which Theon, or others, have long ago vitiated these books, are corrected,
and some of Euclid's demonstrations are restored.
ALSO, THE
BOOK OF EUCLID'S DATA,
IN LIKE MANNER CORRECTED.’
- =
BY ROBERT SIMSON, M.D, - .
Emeritus Professor of Mathematics in the University of Glasgow.
TO THIS EDITION ARE ALSO Annexed -
ELEMENTS OF PLANE AND SPHERICAL TRIGoNoMETRY.
PHILADELPHIA:
PRINTED FOR CONRAD AND Co. A N D So LD AT THEIR Bookstor Es IN
PHILADELPHIA, BALT1 More, PETERssurg, AND Norfolk.
1810. o
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