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It depends on what r is and on what information you have.

Even if r is a radius of a circular shape, you would have different formulae depending on whether:

it is a sphere and you have the volume,

it is a sphere and you have the surface area,

it is a circle and you have the area,

it is a circle and you have the circumference,

it is a circle and you have the length and angle of an arc,

it is a cone and you have volume and height,

it is a cylinder and you have volume and height

etc.

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Q: What is the formula of r?
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