Page:First six books of the elements of Euclid 1847 Byrne.djvu/37

Rh ROM the greater of two given straight lines, to cut off a part equal to the less.



Draw =  (pr. 2.); describe  (post. 3.), then  =.

For =  (def. 15.),

and =  (const.);

∴ = (ax. 1.).

Q.E.D.