Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 274
sition asserts that if ABC isany kind of triangle, and MC, NC are parallelograms on A C, BC,the opposite sidesbeing produced tomeet at P; andif PC is producedmaking QR = PCjand if the parallel-ogram A T is con-structed, then AT—MC + NC. R T For MC = AP = AR, having equal bases and equal altitudes.… … 261 THE TEACHING OF GEOMETRY r\ The Arab writer, Al- Xairrzl (died about 922 A.D.),attributes to Tlmbit ben Qurra (826—901 a.i>. > a proofsubstantially as follows: Th<; four triangles T can be proved congruent. Then if wetake from the whole figure 7 and 7. we have Left the squares onthe…
Geometry
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