Elements of geometry : containing books I to III (1886)
Smith, J. Hamblin · Toronto : W.J. Gage · leaf 99
; I. -47. .. sq. on AC is less tlian sum of sqq. on AB, BC by twicerect. BC, BD. The case, in which the perpendicular AD coincides with AC,needs no proof. Q. E. D. fix. Frove that the sum of the squares on any two sides ofa triangle is equal to twice the sum of the squares on half thebase and on… … Let A be the given rectil. figure.It is reqd. to describe a square that .<li>dl — A. Describe the rectangular CJ B(DE=A. T. 45,Then if BE=E1) £he O BCDE is a .-.|uare,and what was reqd. is done. But if BE be uot = ED, produce BE to F, so that EF= El.i /./ in Q ; and with centre (! and…
Geometry
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