`T_1` is an isosceles triangle in circle C. Let `T_2` be another ísosceles triangle inscribed in C whose base is one of the equal sides of `T_1` and which overlaps the interior of `T_1`. Similarly, create isosceles triangle `T_3` from `T_2; T_4 and T_5`, and so on. Prove that the triangle `T_n`, approaches an equilateral triangle as `n ->oo`,