PLEASE HELP URGENT

A, B and C are three points on a plane such that AB = BC = 1 and CA = $\sqrt3$ Draw three circles whose diameters are $\overline {AB}, \overline {BC}$ and $\overline {CA}$ respectively. The area of the region included in all three circles (the grey region below) is $\dfrac a b \pi +\dfrac {\sqrt c} d$ in simplest form, so a, b, c, d are positive integers, a and b are relatively prime, and c is not divisible by the square of a prime. Enter the values of a, b, c, d in order, separating by commas.

THANKS SO MUCH