Calculate the remaining area of a quadrant with two non overlapping half circles

[georgiboy]

I have been playing with this on and off through the day. I am no mathematician but put together my own logic (Formula) to calculate this (I did have a bit of help from a friend I work with (he loves maths) as I was ), I have then tried to convert that to a VBA function. I will leave the testing to you Aussie.

Formula:
=LET(rQ,A1,r,A2,p,PI(),p*rQ^2/4-p*r^2/2-p*((rQ^2-r^2+9)/(2*(rQ+r)))^2/2)

Function:

Function EvalQuadArea(Rq As Double, r As Double) As Double
    Dim p As Double, R2 As Double
    
    p = Application.PI
    R2 = (Rq ^ 2 - r ^ 2 + 9) / (2 * (Rq + r))
    EvalQuadArea = p * Rq ^ 2 / 4 - p * r ^ 2 / 2 - p * R2 ^ 2 / 2
End Function

I may have completely missed the point here but this really tested my brain and it is what it is, and I have now admitted defeat.