Page:First six books of the elements of Euclid 1847 Byrne.djvu/57

Rh T a given point in a given straight line, to make an angle equal to a given rectilineal angle.

Draw between any two points in the legs of the given angle. Construct (pr. 22.). so that =,  =  and.

Then =  (pr. 8.).

Q.E.D.