## How do you find the radius of a sphere if you know the area?

The surface area (S) of a sphere equals 4πr², where r is the radius. Using that equation to solve for r: r = √(S / 4π).

## What is the radius of the sphere?

The Radius of a circle or sphere is equal to the Diameter divided by 2.

**How do you find the radius of a sphere if you know the volume?**

Answer: To find the radius of a sphere with the volume, we use the formula: r = (3V/4π)

### How do we find the radius of a circle?

How to Find the Radius of a Circle?

- When the diameter is known, the formula is Radius = Diameter/ 2.
- When the circumference is known, the formula is Radius = Circumference/2π.
- When the area is known, the formula for the radius is Radius = ⎷(Area of the circle/π).

### What is a formula for a sphere?

The formula for the volume of a sphere is V = 4/3 πr³.

**How do you calculate the surface area of a sphere?**

Also, assuming the same radius and diameter for a sphere, the surface area and volume of that sphere are returned. You may click on Clear Values to do another calculation. The formulas are as follows: area = PI * (radius) * (radius) or. area = PI * (diameter / 2) * (diameter / 2)

## What is the formula to find the area of a circle?

The formulas are as follows: area = PI * (radius) * (radius) or. area = PI * (diameter / 2) * (diameter / 2)

## How do you find the radius of a circle?

Enter the area contained within a circle. This is the radius of a circle that corresponds to the specified area. The radius is the distance between the centre and any point on the outer edge of a circle.

**How to describe the area of a circle on a spherical manifold?**

On a (flat) Euclidean plane, the area of a circle with a radius r can be described by the function A ( r) = π r 2. But how can one describe the area of the same circle on a spherical manifold? Assuming that the radius of the sphere is an Euclidean distance of d, how would A ( x) look?

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