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Damn this place truly is full of uncs
At least six.
Or maybe 7
A few Rhode Islands.
It’s at least larger than an atom of hydrogen.
Yes.
About yay big
The area is πab, assuming an ellipse with semi-major axis a and semi-minor axis b (where a≥b).
What happens if b≥a?
Since you wrote b≥a, and not b>a, If b=a, then a=b, so the formula still applies, but it’s not an oval, it’s a circle. Technically an elipse has to have the semi-major axis (a) longer than the semi-minor axis (b).
But there is a detailed explanation of your question here:
https://en.wikipedia.org/wiki/Semi-major_and_semi-minor_axes
