Page:First six books of the elements of Euclid 1847 Byrne.djvu/77

Rh O construct a parallelogram equal to a given triangle and having an angle equal to a given rectilinear angle.

Make =  (pr. 10.)

Draw.

Make =  (pr. 23.)

Draw (pr. 31.)

= twice (pr. 41.)

but =  (pr. 38.)

∴ =.

Q. E. D.