Online area calculator which allows to calculate the area of a rectangle, square, triangle or circle.

area online

The calculator is able to **calculate the usual areas online**. It can calculate the area of a rectangle, the area of a square, the area of a circle,
the area of a triangle. The area calculator specifies the calculation steps to obtain the result.

The **area of a rectangle** is given by the **formula `(L*l)`** where L represents the length and l the width a side.
The **area of a rectangle** is equal to the product of its sides.
The area calculator supports both numerical and literal expressions, the calculated length is returned in exact and approximate form.

Thus, the **calculation of the area of a rectangle** whose length is 3 and width is 2 is done by entering the following formula
area(`3;2`).

The area calculator is able to calculate the **area of a square** which is given by the **formula `a^2`** where a
is the length of one side of the square. The calculated area is returned in exact and approximate form.

Thus, the **calculation of the area of a square** whose length of one side is 3 is done by entering the following formula
area(`3`).

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

Thus, the **calculation of the area of a circle** of radius 3 is done by entering the following formula
area(`3`).

The area calculator is able to **calculate the area of a triangle from its 3 sides** using Heron's formula, which is written as follows:
`S=sqrt(p*(p-a)*(p-b)*(p-c)`, where a, b, c represent the length of the sides of the triangle, and p is the half perimeter `p=(a+b+c)/2`.
The calculated area is returned in exact and approximate form.

Thus, the **calculation of the area of a triangle** whose length of each side would be respectively equal to 5, 6 and 7 is done by entering the following formula
area(`5;6;7`).

To apply the different calculation formulas, several quizzes on the calculation of the area of the square, the rectangle, and the circle are proposed.

Online area calculator which allows to calculate the area of a rectangle, square, triangle or circle.

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

- area(`3;2`) , returns 6
- area(`4`) , returns [16;`16pi`], 16 is the area of a square of length 4, and `16pi` is the area of a circle of radius 4.

See also

- Calculation of the area of a geometric figure. : area. Online area calculator which allows to calculate the area of a rectangle, square, triangle or circle.
- 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.
- Find equation of a straight line from two points : equation_straight_line. The equation straight line calculator allows to calculate the equation of a straight line from the coordinates of two points with step by step calculation.
- Perimeter calculator : 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.
- Pythagorean theorem calculator : pythagorean. The calculator uses the Pythagorean theorem to verify that a triangle is right-angled or to find the length of one side of a right-angled triangle.
- 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.

Geometry