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18
BOOK I. PROP. XVIII. THEOR.
N any triangle 
if one side 
be greater than another 
, the angle opposite to the greater side is greater than the angle opposite to the less.
i. e. 
> 
Make 
= (pr. 3.), draw 
.
Then will 
= 
(pr. 5.);
but > (pr. 16.)
∴ > and much more is >
Q.E.D.
