Table of Contents

## What is the easiest way to find the diameter of a circle?

If you know the radius of the circle, double it to get the diameter. The radius is the distance from the center of the circle to its edge. If the radius of the circle is 4 cm, then the diameter of the circle is 4 cm x 2, or 8 cm. If you know the circumference of the circle, divide it by π to get the diameter.

## How is diameter calculated?

If you know the circumference, you can divide the circumference by pi and this will be your diameter (diameter = circumference / pi).

**How do you write the radius of a circle?**

How to Find the Radius of a Circle?

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

**How to calculate the area of a circle?**

In practice, when measuring circles it is often easier to measure the diameter, then divide by 2 to find the radius. You need the radius to work out the area of a circle, the formula is: circle area = πR 2. π = Pi is a constant that equals 3.142. R = is the radius of the circle. R 2 (radius squared) means radius × radius.

### Which is the correct way to calculate the diameter of a circle?

If you know the circumference of the circle, divide it by π to get the diameter. π is equal to approximately 3.14. but you should use your calculator to get the most accurate results. Example. If the circumference of the circle is 10 cm, then the diameter is 10 cm/π, or 3.18 cm.

### How big is a circle with a diameter of 3M?

The area of a circle with a diameter of 3m is 7.0695m 2. This example pulls on much of the content of this page for solving simple area problems. This is the Ruben M. Benjamin House in Bloomington Illinois, listed on The United States National Register of Historic Places (Record Number: 376599).

**Which is an example of the radius of a circle?**

The radius is the distance from the center of the circle to its edge. Example. If the radius of the circle is 4 cm, then the diameter of the circle is 4 cm x 2, or 8 cm.