Million. ('thousand thousand')
If you mean square units within a circle then it is:- Area = pi*radius squared
Yes. The circles can be of different size. These are called concentric circles.
concentric circles
A cylinder has two circles as its bases.
by running in circles
Track is running in circles and cross country is just running.
It's not an idiom because you can figure out the meaning if you think - if you're running around in circles, you're not getting anywhere. It's a metaphor for fruitless work.
Maybe bc he is running circles around you.
Silver Circles by Telescope.
because when the tail is removed it messes with their balance and sense of direction.
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"They are circles."
Nothing
squares and circles
to turn around in circles
drawing Circles