Ceiling pull switch on an electrical diagram--see link
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The inside of a circle is called its area.
I believe the FM is Franklin Mint. Not sure about the number. Might be the whole is the copyright designation since the copyright symbol (c in a circle) precedes the fm85
To find the area of the circle pi*radius*squared and subtract the area of the figure inside
Inscribed
The circumference of a circle is the distance arround the edge of the circle. The area of a circle is how big the inside of the circle is.