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

Perimeter calculator

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.

Calculating perimeter of a rectangle

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`).

Calculating perimeter of a square

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`).

Calculating the perimeter of a circle

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`).

Calculation of the perimeter of a triangle

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 7, is obtained by entering the following formula perimeter(`5;6;7`).

Games on the perimeters of geometric figures

The site proposes games on the calculation of the perimeters of the usual geometrical shapes: squares, rectangles and circles.

Syntax :

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

Examples :

• 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.