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Online perimeter calculator that calculates rectangle perimeter, square perimeter, triangle perimeter or circle perimeter.

Perimeter online

The calculator is able to **calculate online perimeters** : the perimeter of a rectangle,
the perimeter of a square, the perimeter of a circle.
The length calculator supports numeric but also literal expressions.

The **perimeter of a rectangle** is given by the **formula `2*(L+l)`** where L represents the length and l the width of a side.
The **rectangle perimeter** is equal to the sum of the sides.

The **calculation of the perimeter of a rectangle** whose length is 3 and width is 2 is done
by entering the following formula
perimeter(3;2).

The **perimeter of a square** is given by the **formula `4*a`** where a is the length of a side.
The perimeter of a square is the length of this square.

The length calculator is able to calculate the **square perimeter**, the calculated length is returned in exact form and
in approximate form.
Calculating the perimeter of a square whose side length is 3 is done by entering the following formula
perimeter(3).

The **perimeter of a circle** is given by the **formula `2*pi*r`**,
where r is the radius of the circle. The perimeter of a circle is the length of the circle.
The length calculator is able to calculate the **circle perimeter**, the calculated length is returned in exact form and
in approximate form.

Calculation of the perimeter of a circle of radius 3 is done by entering the following formula perimeter(3).

The **perimeter calculator** is able to calculate the **perimeter of a triangle**,
which is given by the **formula `a + b + c`** where a, b and c are the length of each side of the triangle.
The calculated length is returned in exact form and in approximate form.

Thus, the **calculation of the perimeter of a triangle** whose length of each of the sides is equal to 5, 6 and 12,
is obtained by entering the following formula
perimeter(5;6;12).

Online perimeter calculator that calculates rectangle perimeter, square perimeter, triangle perimeter or circle perimeter.

- perimeter(length;width) for a rectangle
- perimeter(length) for a square
- perimeter(length;length;length) for a triangle
- perimeter(radius) for a circle

- perimeter(3;2) , returns 12
- perimeter(4) , returns [16;`8pi`], 16 is the perimeter of a square of length 4, and `8pi` is the perimeter of a circle of radius 4.

See also :

- Area of a circle : area_circle. Area online calculator that can calculate the area of a circle from its radius or from its diameter.
- Area of a rectangle : area_rectangle. Area online calculator that can calculate the area of a rectangle from its length and its width.
- Area of a square : area_square. Area online calculator that can calculate the area of a square from the length of a side.
- Measurement conversions : convert. The measurement unit calculator allows online conversions volume, surface (area), length.
- Perimeter : perimeter. Online perimeter calculator that calculates rectangle perimeter, square perimeter, triangle perimeter or circle perimeter.
- Perimeter of a circle : perimeter_circle. Online calculator that calculates the perimeter of a circle from its radius.
- Perimeter of a rectangle : perimeter_rectangle. The online calculator allows to calculate the perimeter of a rectangle from its length and its width.
- Perimeter of a square : perimeter_square. The online calculator allows to calculate the perimeter of a square from the length of a side.
- Time converter : time_converter. Time calculator that can convert durations into seconds, minutes, hours and days.
- Volume of a cube : volume_cube. The online calculator allows to calculate the volume of a cube from the length of a side.
- Volume of a rectangular parallelepiped : volume_rectangle. The online calculator allows to calculate the volume of a rectangle from its length, its width and height.
- Volume of a sphere : volume_sphere. The online calculator allows to calculate the volume of a sphere from its radius.