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To find the circumference of a circle, use the equation:

Circumference = 2*π*radius

so when the radius is r, the circumference is 2πr

Q: What is the circumference when the radius is r?

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Circumference = 2*pi*r r(radius) = Circumference/(2*pi) r = 20.5/6.283185307 = 3.26 ======

If the radius is r then the circumference is 2*pi*r So r -= circumference/(2*pi) = 1.13 units.

Circumference = πd diameter = 2 x radius

The circumference of a circle is equal to the radius times 2*pi. 2*pi*R where R is the radius.

Circumference = 2pi*r Circumference = 86pi

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If the radius is r then the circumference is 2*pi*r So r -= circumference/(2*pi) = 1.13 units.

Circumference = 2*pi*r r(radius) = Circumference/(2*pi) r = 20.5/6.283185307 = 3.26 ======

c=2*pie*r c= circumference r= radius.

Circumference = πd diameter = 2 x radius

The equation for circumference is C=2(pi)(r) where C is the circumference and r is the radius. You can find the radius by plugging in the circumference into this equation and solving the equation.

The circumference (c) of a circle = 2πr (where r = radius). Therefore if you know the circumference, the radius (r) = c/2π.

The circumference of a circle is equal to the radius times 2*pi. 2*pi*R where R is the radius.

The equation for circumference is 2(3.14)(r) or 3.14(d) where r=radius and d=diameter. The radius of a circle is half of the circumference, or the distance across the interior of a circle.

circumference is the distance around a circle diameter is the distance from one point on the circle, straight across to the other side. radius is distance from the center of the circle to any point on the circle radius = r diameter = 2r circumference = 2(pi)r pi = 3.1415927

circumference equal 2*pi*r(radius) C=2PiR

Circumference = 2pi*r Circumference = 86pi

Circumference, C = 2*Pi*R Area, A = Pi * R^2 A = C Pi * R^2 = 2*Pi*R --> solve for R (radius) R = 2 So, the radius of a circle with area = circumference is two.