**Circle Calculator**

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## Definition

** Circle** is the set of all points in a plane at a fixed distance, called the radius, from a given point called the center. Other properties of a circle are:

**Circumference:**is the length of the edge of the circle.**Diameter:**is the longest straight line that can be drawn from one point on the circumference to another point on it. It passes through the center of the circle.

## Formula

** Area: **Area of a Circle is calculated by the formula:

**π * (Radius)**

^{2}** Circumference: **This is calculated by the formula:

**2 * π * Radius**

** Diameter: **Diameter is twice the radius of the circle and hence:

**2* Radius**

** Pi: **This is the ratio of Circumference of the circle to the Diameter of the circle. This is usually represented by the symbol

**“π”**and has a value of 3.14159…

## Units: Measurement units of Area, Radius, and Circumference

** Meter (m): **is the base unit of length in the International System of Units (SI). Meter is defined as the distance traveled by light in a specific fraction (1299 792 458) of a second.

** Other SI units:** are millimeter (mm) ie 1/1000 of m, centimeter (cm) which is 1/100 of m and kilometer (km) which is equal to 1000m.

__Other English units of measure of distance are__:

** Mile**: An English unit of length, it is equal to 1609 meters (m).

__: It is equal to 0.9144 meters (m).__

**Yard**__: It is equal to 0.3048 meters (m).__

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