There is a circle with a radius of 4cm and a square that is 5 * 5.

2 corners (diagonally opposite) of the square are touching the circumference of the circle. Calculate the area overlap of the square and circle.

At first when I read the problem I thought it was pretty simple. But I then realised it wasn't - there's 2 segments that stick out that you have to subtract (segment AC and BD).

I just can't seem to find the area of the 2 segments that stick out. I can solve the rest. Can anyone show me or hint to me what I'm not seeing?