## Circle area and circumference calculations

The circle area calculator is designed for calculations of **radius, diameter, circumference or area** of a circle. For successful calculation, you **need to know** and enter into the calculator **at least one of parameters**. Then press send or enter to run calculations.

## Parameters sketch:

## Calculator form:

## Variables and constants explanation:

**r** – radius**C** – circumference

d – diameter

A – area**π**– 3,1415926535

– unspecified values

– specified values

– calculated values

## Circle circumference calculation formula:

## Circle area calculation formula:

## Circle area calculator use:

Circle calculation is used in many industries and in a huge number of calculations. This is at least some of them:

- perimeter of a tree trunk, limb, twig, stem, pipe, tube, hose, duct, wire, rod, cord, thread, rope, tunnel, pillar
- cross-sectional area of a tree trunk, limb, twig, stem, pipe, tube, hose, duct, wire, rod, cord, thread, rope, tunnel, pillar
- partial calculations of geometric shapes like cilinder, cone, sphere, barrel, torus and other rotational shapes
- school calculations