To the extent possible under law, the Text Creation Partnership has waived all copyright and related or neighboring rights to this keyboarded and encoded edition of the work described above, according to the terms of the CC0 1.0 Public Domain Dedication (http://creativecommons.org/publicdomain/zero/1.0/). This waiver does not extend to any page images or other supplementary files associated with this work, which may be protected by copyright or other license restrictions. Please go to http://www.textcreationpartnership.org/ for more information.
* 1.1 SƲppose you were at a Billiard Table, and you would strike a Ball B by reflection, with another Ball A: Admit CD be one Side of the Table, now ima∣gine a perpendicular Line BDE; I take the Line DE equal to DB; I say, that if you aim and strike your Ball A direct∣ly towards the Point E, the Ball A meeting the Side of the Table at F, shall reflect from thence to B; for in the Triangle
BFD, EFD, the Side FD is com∣mon, and the Sides BD, DE, equal, the Angles BFD, EFD equal, by the Proposition, the Angles AFC, DFE, being opposite are also equal, as I shall demon∣strate hereafter; therefore the Angle of incidence AFC, is equal to the Angle of reflection BFD, and by consequence the reflection will be from AF to FB.
Use 4.