Rhombus is a parallelogram in which all four sides are equal and opposite pairs of lines are congruent. The opposite angles in a rhombus are equal. It is a special type of parallelogram in which all sides are equal to each other. The internal angle of the Rhombus is not mandatory to be a right angle.
The area of a Rhombus is the total space enclosed by its sides in a 2d Plane.
Using the formula based on the diagonals:
Where:
- p is the length of one diagonal.
- q is the length of the other diagonal
Note: Rhombus often gets confused with square but rhombus is very different from the square.
Read more: Why is a rhombus not a square?
Table of Content
Area of Rhombus Formula
Area of the rhombus can be found using various methods some of which are listed in the table below
| Area of Rhombus Formula | |
|---|---|
| If Base and Height are given | A = b × h |
| If Diagonals are given | A = ½ × p × q |
| If Base and Interior angle is given | A = b2 × Sin(a) |
Where,
- p = length of first diagonal
- q = length of second diagonal
- b = length of side of rhombus
- h = height of rhombus
- a = measure of an interior angle
Area of Rhombus Formula Derivation
Below is the proof of area of Rhombus formula.
⇒ Let us consider a rhombus ABCD with O as the point of intersection of two diagonals AC and BD.
The area of rhombus will be
Area = 4 × area of △AOB
= 4 × (1/2) × AO × OB sq.units
= 4 × (1/2) × (1/2) d1 × (1/2) d2 sq. unit
= 4 × (1/8) d1 × d2
= 1/2 d1 × d2Therefore, the area of a rhombus is A = 1/2 d1 × d2.
How to Find Area of Rhombus
The area of the rhombus can be calculated by three different methods: diagonal, using base and height, and using trigonometry.
These are the three important methods for finding area of Rhombus:
- Area of Rhombus when Diagonals are given
- Area of Rhombus using Base and Height
- Area of Rhombus using Trigonometric Ratios
Area of Rhombus with Diagonals
Area = (d1 × d2)/2 sq. units
Where,
d1 is the length of diagonal 1
d2 is the length of diagonal 2
Let's try to understand this formula with the help of an example.
Example 1: Find the area of a rhombus having diagonals 16 m and 18 m.
Solution:
Diagonal 1, d1 = 16 m
Diagonal 2, d2 = 18 mArea of a rhombus, A = (d1 × d2) / 2
= (16 × 18) / 2
= 288 / 2
= 144 m2Thus, the area of the rhombus is 144 m2
Area of Rhombus using Base and Height
Area of a Rhombus = b × h sq units
Where,
b is the length of any side of the rhombus
h is the height of the rhombus
Example 2: Find the area of a rhombus having base of 12 m and height is 16 m.
Solution:
Base, b = 12 m
Height, h = 16 m
Area, A = b × h
= 12 × 16 m2
A = 192 m2Thus, the area of the rhombus is 192 m2
Area of Rhombus using Trigonometric Ratios
Area of a Rhombus = b2 × sin(A) sq. units
Where,
b is the length of any side of the rhombus
A is a measure of any interior angle
Example 3: Find the area of a rhombus if the length of its side is 12 m and one of its angles A is 60°
Solution:
Side = s = 12 m
Angle A = 60°
Area = s2 × sin (60°)
A = 144 × √3/2
A = 72√3 m2
Area of Rhombus Solved Examples
Example 1: Calculate the area of a rhombus (using base and height) if its base is 5cm and height is 3cm.
Solution:
Given, base (b) = 5cm
height of rhombus(h) = 3cmNow, Area of the rhombus(A) = b × h
= 5 × 3
= 15cm2
Example 2: Calculate the area of a rhombus (using diagonal) having diagonals equal to 4cm and 3cm.
Solution:
Given, length of diagonal 1 (d1) = 4cm, Length of diagonal 2 (d2) = 3cm
Now,
Area of Rhombus (A) = 1/2 d1 × d2
= 4 x3/2 = 6cm2
Example 3: Calculate the area of the rhombus (using trigonometry) if its side is 8cm and one of its angles A is 30 degrees.
Solution:
Side of the rhombus (b) = 8cm, angle (a) = 30 degrees
Now,
Area of the rhombus(A) = b2 × sin(a)
= (8) × sin(30)
= 64 × 1/2 = 32 cm2
Example 4: Calculate the base of a rhombus if its area is 25cm2 and height is 10cm.
Solution:
Given,
Area = 25 cm2
height of rhombus(h) = 10 cmNow,
Area of the rhombus(A) = b × h
25 = b × 10
= 2.5 cm
Area of Rhombus - Practice Problems
Question 1: Calculate the area of a rhombus with diagonals of 8 cm and 12 cm.
Question 2: The area of a rhombus is 54 cm². If one diagonal is 12 cm, find the length of the other diagonal.
Question 3: A rhombus has diagonals of 10 m and 16 m. What is its area in square meters?
Question 4: The diagonals of a rhombus are in the ratio 3:4, and its area is 150 cm². Find the lengths of the diagonals.
Question 5: The area of a rhombus is 40 m². If one diagonal is twice the length of the other, find the lengths of both diagonals.
Question 6: A square has a diagonal of 10√2 cm. What would be the area of a rhombus with diagonals equal to the sides of this square?
Question 7: The diagonals of a rhombus are 18 cm and 24 cm. Find the length of its side.
Question 8: A rhombus has an area of 96 cm² and one of its diagonals is 16 cm. What is the perimeter of the rhombus?
Answer Key
Answer 1: Area of a rhombus with diagonals 8 cm and 12 cm: 48 cm²
Answer 2: The other diagonal when the area is 54 cm² and one diagonal is 12 cm: 9 cm
Answer 3: Area of a rhombus with diagonals 10 m and 16 m: 80 m²
Answer 4: Diagonals of a rhombus with area 150 cm² and diagonals in the ratio 3:4: 15 cm and 20 cm
Answer 5: Diagonals of a rhombus with area 40 m² and one diagonal twice the other: 16 m and 8 m
Answer 6: Area of a rhombus with diagonals equal to the sides of a square with diagonal 10√2 cm: 50 cm²
Answer 7: Side length of a rhombus with diagonals 18 cm and 24 cm: 15 cm
Answer 8: Perimeter of a rhombus with area 96 cm² and one diagonal 16 cm: 40 cm
Related Articles: