الدكتور/ أسامه فؤاد شعلان | Professeur docteur oussama ...
The Quadrature of the Parabola. If the first term in this series is the area of the triangle, then the second is the sum of the areas of two triangles whose bases are the two smaller secant lines, and so on. This proof is a variation of the infinite series 1/4 + 1/16 + 1/64 + 1/256 + · · · which sums to 1/3.