In obtuse-angled triangles, if a perpendicular be drawn from either of the acute angles to the opposite side produced, the square of the side subtending the obtuse angle, is greater than the squares of the sides containing the obtuse angle, by twice the... Elements of Geometry: Containing the First Six Books of Euclid, with a ... - Σελίδα 62 των John Playfair - 1819 - 333 σελίδες Πλήρης προβολή -
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