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It is a trade mark registration symbol so no one can copy it in the country it was registered

Q: What does the r with a circle aound it mean on food?

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You mean what Is the circumference of a circle? pi*(r)squared.

A little R in a circle usually means "registered trademark".

Symbol for "registered trademark"

registered trade mark ®

R means radius because the area of a circle = pi*radius2

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R = Radius The radius is half the diameter of a circle.

You mean what Is the circumference of a circle? pi*(r)squared.

radius

A little R in a circle usually means "registered trademark".

A circle does not have a circumstance. Assuming that you mean circumfernece, the answer is c = 2*pi*r

If you mean the circumference or "perimeter": C = 2(pi)r, where r is the radius of the circle

Symbol for "registered trademark"

that symbol means trademark

if you mean an arc, then pi x r

registered trade mark ®

R means radius because the area of a circle = pi*radius2

That's the formula for the area of a circle.