radius
It is r*sqrt(2) = 1.414*r, approx.
stronger?
a cirlce with a v inside it means that its a volt meter
If you mean the circumference or "perimeter": C = 2(pi)r, where r is the radius of the circle
that symbol means trademark
if you mean an arc, then pi x r
A capital city.
That's the formula for the area of a circle.
The length of the longest straight path inside a circle.
It means your online.
use the equation Area=pi*r2 r is the radius of a circle If you are presented with the diameter of the circle, divide by 2 to receive the radius. Now, square and multiply by pi.