In math, an exclamation point means 'factorial.' This means you multiply that number by all of its previous numbers.
For example, 4! means 4*3*2*1.
I've never seen one inside a circle, though, so I'm not sure exactly what that means!
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The line from the center of a circle to a point on the circle is the radius.
It is the circle's center point
The radius is the distance between the center of a circle and a point on the circle
Any point whose distance from the centre of the circle is smaller than the radius of the circle.
It is the centre of the circle