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22
BOOK I. PROP. XXII. THEOR.
IVEN three right lines 
the sum of any two greater than the third, to construct a triangle whose sides shall be respectively equal to the given lines.
Assume 
= 
(pr. 3.).
Draw 
= 
(pr. 2.),
and 
= 
(pr. 2.).
With and as radii,
describe 
and 
(post. 3.);
draw 
and 
,
then will 
be the triangle required.
For = ,
= = (const.),
and = = (const.).
Q.E.D.
