Circle Area and Circumference
Calculate the area and circumference of a circle.
unit
Result
78,5398 br²
Area: 78.5398 unit² · Circumference: 31.4159 unit
Result in all units
Step-by-step solution
What Is the Area of a Circle?
The area of a circle is the surface covered by a circle whose radius is known. It is found using the constant Pi (π).
How is it calculated?
How Is It Calculated?
Area = π × r² (r: radius, π ≈ 3.14159)
- Enter the radius.
- Multiply the square of the radius by π.
For example, r = 5: π × 25 ≈ 78.5.
Frequently Asked Questions
What should I do if I know the diameter?
The radius is half the diameter; divide the diameter by 2 and use it as r.