Circle Area Calculator
Calculate the area of a circle from its radius. Area = π × r².
Area
Frequently Asked Questions
How do you calculate the area of a circle?
Area = π × r². Square the radius, then multiply by π (approximately 3.14159). For example, a circle with radius 5 has an area of π × 25 ≈ 78.54.
What is the value of π used in the calculation?
The calculator uses the JavaScript constant Math.PI, which is approximately 3.141592653589793.