Isosceles trapezoid ABCD, with AB∥CD, is such that there exists a circle Γ tangent to its four sides. Let T \equal{} \Gamma \cap BC, and P \equal{} \Gamma \cap AT (P=T).
If \frac{AP}{AT} \equal{} \frac{2}{5}, compute CDAB. geometrytrapezoidratiotrigonometrygeometry unsolved