Quadrilateral ABCD is inscribed in a circle with segment AC a diameter of the circle. If m∠DAC = 30° and m∠BA?

Quadrilateral ABCD is inscribed in a circle with segment AC a diameter of the circle. If m∠DAC=30° and m∠BAC=45°,the ratio of the area of ABCD to the area of the circle can beexpressed as a common fraction in simplest radical form interms of π as (a+ sqrt(b))/cpi. What is the value of a + b + c?