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

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.

- 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

- Area of a square : area_square. Area online calculator that can calculate the area of a square from the length of a side.
- 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.
- 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 square : perimeter_square. The online calculator allows to calculate the perimeter of a square from the length of a side.
- 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.
- 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.
- 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.
- 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.