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.