Page:First six books of the elements of Euclid 1847 Byrne.djvu/56

22 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.