Perimeter of a Rhombus
All four sides of a rhombus are equal.
Live Calculator
MembersVariables
Example
A rhombus with side 6: P = 4·6 = 24 units.
How it works
A rhombus is a four-sided shape with equal side lengths, so its perimeter is found by adding the same side four times. That is why the formula is P = 4a: the total distance around the shape is four identical edges. It works for every rhombus because the side length is the only measurement needed to find its perimeter.
When to use it
Use this formula when you need the distance around a rhombus, such as in geometry problems, fencing layouts, tile designs, or finding the boundary of a diamond-shaped figure. It is especially useful when the side length is given directly.
Worked example, step by step
A rhombus has side length 9 cm. P = 4a P = 4 × 9 P = 36 So, the perimeter is 36 cm.
Common mistakes to avoid
- Using the formula for area instead of perimeter
- Multiplying by 2 instead of 4
- Forgetting to include units in the final answer
Did You Know?
All four sides of a rhombus are equal, so its perimeter is simply four times one side.
Share this formula
More in Geometry & Trigonometry
View allPythagorean Theorem
BasicRelates the sides of a right triangle.
Area of a Circle
BasicThe area enclosed by a circle.
Circumference of a Circle
BasicThe perimeter (boundary length) of a circle.
Equation of a Circle
IntermediateThe standard form of the equation of a circle with centre (h, k) and radius r.
Area of a Rectangle
BasicArea of a rectangle.
Area of a Triangle
BasicArea of a triangle from base and height.