Question

A circle has equation (x-a)^2 +(y-a)^2=a^2 where a is a constant.t. The line y+x-a=0 splits the area of the circle into 2 parts, A1
and A2 where A1>A2. Find the area of A2
giving your answer in the form ((a^2)/b)*(c*pi + d) where b c, and d are integers.