Question 1

How do you calculate the area of a circle?

Accepted Answer

The area of a circle is calculated using the formula A = π × r², where r is the radius of the circle. Simply square the radius and multiply by π (approximately 3.14159). For example, if the radius is 5 cm, the area is π × 25 = 78.54 cm².

Question 2

What units are supported by this circle area calculator?

Accepted Answer

This calculator supports centimeters (cm), meters (m), inches (in), feet (ft), and custom units. The result is displayed in square units (cm², m², in², ft²) based on your selection.

Question 3

Can I calculate area from diameter instead of radius?

Accepted Answer

This calculator uses radius directly. If you have the diameter, simply divide it by 2 to get the radius. For example, if diameter is 10 cm, radius is 5 cm, and area is π × 5² = 78.54 cm².

Question 4

What is π (pi) value used in this calculator?

Accepted Answer

This calculator uses JavaScript's Math.PI constant, which is approximately 3.141592653589793. Results are displayed to 4 decimal places for precision.

Area of a Circle Calculator