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

[p45cal]

For the purpose of this exercise then yes it just happens that the bigger half circle is half the size of the radius of the quadrant. Done the track it may not. In fact I envisage that either the Quadrant or the half circles may differ in dimensions from those supplied in the graphic.

So, back to msg#2:
"when the HalfCircle1Radius is not half the QuadrantRadius:
1. Can it be bigger than half the QuadrantRadius?"
It seems no.
"2. Where along the horizontal leg of the quadrant does it sit?"

Also,

Done the track it may not.

I can't work out what this means.