Formula for

**Area**of**circle**. The formula to find a**circle's area**(radius)^{2}usually expressed as π ⋅ r 2 where r is the radius of a**circle**. The**area**of a**circle**is all the space inside a**circle's**circumference.So, what is the meaning of area of a circle?

**Definitions**and formulas for the radius of a

**circle**, the diameter of a

**circle**, the circumference (perimeter) of a

**circle**, the

**area of a circle**, the chord of a

**circle**, arc and the arc length of a

**circle**, sector and the

**area**of the sector of a

**circle**.

Why do we use pi to calculate the area of a circle?

**Pi**(π), the 16th letter of the Greek alphabet, is

**used**to represent the most widely known mathematical constant. By definition,

**pi**is the ratio of the circumference of a

**circle**to its diameter. In other words,

**pi**equals the circumference divided by the diameter (π = c/d).

How do you find the exact area of a circle?

If the object is a

**circle**, and you know its circumference, you would divide the circumference by pi to**find**the diameter of the**circle**. Half the diameter is the radius. Square the radius and multiply by pi to**find**the**area**of the**circle**.