Assignment:
Determine whether it is possible to find a circumscribable, isosceles "true" trapezoid (in which the parallel sides are not congruent) that has each of the following properties. Justify the answer.
a) A diagonal bisects an angle of the trapezoid.
b) The trapezoid is cyclic
c) The diagonals are perpendicular to each other
Provide complete and step by step solution for the question and show calculations and use formulas.