The formulas for calculating the area of ​​the circle and the circumference of the circle are most complete

In this article, I will introduce to you the formula for calculating the area of ​​a circle and the circumference of the circle most completely and accurately. Stay tuned.

What is circle?

In terms of the plane, the circle is the area limited internally by a circle. Center, the radius of the circle is the center, the radius of the surrounding circle.

1. The formula for calculating the area of ​​a circle

- Concept

Calculate the area of ​​a circle is to calculate the area inside the circle.

The formulas for calculating the area of ​​the circle and the circumference of the circle are most complete

The pink part is the area of ​​the circle

- Recipe

The area of ​​a circle is calculated by the formula: Square radius of circle multiplied by Pi .

The formulas for calculating the area of ​​the circle and the circumference of the circle are most complete

The formula for calculating the area of ​​a circle

Inside:

+ r : Radius of a circle

+ π : Constant Pi (π = 3.14)

- Meaning

The formula for the area of ​​a circle helps you calculate the total surface area inside the circle.

2. The formula for calculating the circumference of the circle

- Concept

The circumference of a circle, also known as the length of a circle, is the boundary line separating the inside from the outside of the circle.

The formulas for calculating the area of ​​the circle and the circumference of the circle are most complete

Circumference is the length of the circle

- Recipe

The circumference of the circle is calculated using the formula: Diameter multiplied by Pi or twice the radius multiplied by Pi .

The formulas for calculating the area of ​​the circle and the circumference of the circle are most complete

Formula to calculate the circumference of a circle

In which :

+ r : Radius of a circle

+ d : Diameter of circle

+ π : Constant Pi (π = 3.14)

- Meaning

Because circles cannot be measured with a ruler, you can use the circumference of a circle to get the length of the circle.

3. How to calculate the area of ​​a circular fan

- Concept

A circular fan shape is a part of a circle limited by two radii and an arc shielded by these two radii.

The formulas for calculating the area of ​​the circle and the circumference of the circle are most complete

The blue part is the circular fan-shaped area

- Recipe

The area of ​​a round fan is calculated by the formula:

The formulas for calculating the area of ​​the circle and the circumference of the circle are most complete

The formula for calculating the area of ​​a round fan

In which :

+ r : Radius of a circle

+ π : Constant Pi (π = 3.14)

+ l : The length of the arc

- Meaning

The fan-shaped area formula makes it easy to calculate the area of ​​the part of the plane inside the circle.

Above are the formulas to calculate the perimeter, the area of ​​a circle and the circle fan. Thank you for watching and see you in the following articles.

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