Explanation

What is Circle?

A circle is defined by its radius. Diameter, circumference, and area are derived from it.

What this calculator does

Find circumference and area from radius.

Inputs you need

• Radius

Formula

• Diameter: 2r
• Circumference: 2pi r
• Area: pi r^2

Example

For radius 8:

• Diameter = 16
• Circumference ≈ 50.27
• Area ≈ 201.06

Quick input set you can try:

• Radius: 8

FAQ

1) What does this calculator help with? It helps you calculate Circle quickly and with consistent formulas.

2) Which formula is used? It uses the standard method shown in the formula section on this page.

3) Can I use decimal values? Yes. Decimal values are supported for most numeric fields.

4) Should I rely on this for final decisions? Use it as a practical estimate, and verify critical decisions with official documents or expert advice.