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Van Schooten's Ruler Constructions - Solution to Problem VII

Author(s): 
C. Edward Sandifer

Problem VII:   Given an indefinitely long line AB and a point C away from it, to draw CF which makes an angle with the given line AB which is equal to a given angle E.

 

Construction:   To the point A in AB, construct, following the previous problem, and angle DAB, equal to E, and draw C, from the 3rd problem, line CF parallel to the line AD:  I say the angle CFB is equal to the angle E.

Branch point:     

        The other eight problems

                          

Dummy View - NOT TO BE DELETED