# Area and Perimeter

# Circle - Metric

Calculate the area and perimeter (circumference) of a circle.

This calculator uses metres for measurements.

Circle = a round shape.

### Circle Area and Perimeter - Metric

#### Calculation

- the diameter of the circle in metres
- decimal precision, the number of digits after the decimal point

#### Results

- the area of the circle in square metres
- the area in square feet
- the area in square inches
- the perimeter of the circle in metres
- the outer perimeter in feet
- the outer perimeter in inches

##### Formula

A = 𝝅/4D²
P = 𝝅D
where A is the area of the circle
𝝅= 3.14159265
D the diameter
P the circumference of the circle

##### Conversions

one metre (m) = 3.28083989501312 feet (ft)
one metre (m) = 39.3700787401575 inches (in)
one square metre (m²) = 10.7639104167097 square feet (ft²)
one square metre (m²) = 1550.0031000062 square inches (in²)

### Area and Perimeter of Various Shapes

### Changing the shape of an Area

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