Elements of geometry, containing books I and II with exercises and notes (1882)
Smith, J. Hamblin (James Hamblin), 1829-1901 · Toronto : Gage · leaf 109
areasof each of these figures may be readily calculated. I02 EUCLIDS ELEMENTS. [Books I. & IL Note 7. On Projections. Tlie projection of a jjoinf B, on a straight line of unlimitedlength AE, is the point M at the foot of the perpendiculardropped from B on AE. The projection of a straight line… … We might employ the term projection with advantage toshorten and make clearer the enunciations of Props, xii. andXIII. of Book II. Thus the enunciation of Prop. xii. might be :— In oblique-angled triangles, the square on the side sub-tending the obtuse angle is greater than the squares on thesides…
Geometry
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