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

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

The area of a circle is pi times the radius squared (A = π r²).

### What is the circumference of 11 radius?

The circumference is approximately 68.1 .

#### What is the square footage of an 11 foot circle?

380.13 square feet
So the calculation would be : (3.1416 x 11 x 11 = 380.13 square feet). Circumference of a circle: The circumference of a circle is the total distance around it, which is often a handy thing to be able to calculate. To do that, you need this formula: pi x diameter.

What is the radius and circumference of a circle?

The Radius is the distance from the center outwards. The Diameter goes straight across the circle, through the center. The Circumference is the distance once around the circle. So when the diameter is 1, the circumference is 3.141592654…

The radius of a circle is the length of the line from the center to any point on its edge. The plural form is radii (pronounced “ray-dee-eye”).

## What is the square footage of a 15 foot circle?

The area of the circle is approximately 706.5 square feet.

### How do you find the area and circumference of a circle?

How to find the area of a circle from the circumference?

1. Divide the circumference by π.
2. Divide the result by 2 to get the circle’s radius.
3. Multiply the radius by itself to get its square.
4. Multiply the square by π, or 3.14 for an estimation.
5. You found the circle’s area from the circumference.

#### How to calculate the area of a circle given its radius?

Use this calculator to easily calculate the area of a circle, given its radius in any metric: mm, cm, meters, km, inches, feet, yards, miles, etc. The formula for the area of a circle is π x radius2, but the diameter of the circle is d = 2 x r 2, so another way to write it is π x (diameter / 2)2. Visual on the figure below:

What is the radius of a 16 foot circle?

For example, if the diameter is 16 feet, then the radius is 16 / 2 = 8 feet. The circumference is therefore 2 x 3.14159 x 8 = 50.26 feet. Circles are often used by architects for athletic tracks, recreational areas, buildings, and roundabouts.

What is the diameter of a circle in math?

The diameter of a circle calculator uses the following equation: π is approximately equal to 3.14. It doesn’t matter whether you want to find the area of a circle using diameter or radius – you’ll need to use this constant in almost every case.

## How do you find the area of a circle in Excel?

Example: find the area of a circle Task 1: Given the radius of a cricle, find its area. For example, if the radius is 5 inches, then using the first area formula calculate π x 5 2 = 3.14159 x 25 = 78.54 sq in.