# Area of Parallelogram – Formula, Vector Form, Facts, Examples, FAQs

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## What Is the Area of Parallelogram?

The area of a parallelogram is defined as the measure of the two-dimensional space enclosed within its boundaries. It is calculated by multiplying the length of the base by its height, which is the perpendicular distance between the base and the opposite side.

A parallelogram is a special quadrilateral in which opposite sides are parallel and equal in length.

The given figure shows a parallelogram ABCD.

AB II CD and AB = CD.

Area of a parallelogram = Base $\times$ Height

You might be wondering if this is the same formula that we use to calculate the area of a rectangle. That’s true!

The formulas for the area of a parallelogram and a rectangle are the same because any parallelogram can be transformed into a rectangle with the same base and height. Try to visualize it with the help of the given diagram!

Since the base and height of the parallelogram remain the same in this transformation, the area of the parallelogram is equal to the area of the resulting rectangle.

## Area of Parallelogram: Formula

The area of a parallelogram can be calculated using the formula:

The base refers to the length of base of the parallelogram. We can choose any of the four sides of a parallelogram as the base.

The height is the perpendicular distance between the base and the opposite parallel side. It’s important to note that the height must be measured perpendicular to the base we choose.

Let’s say the base of the parallelogram is represented by ‘b‘ units and the height by ‘h‘ units.

The formula for the area of the parallelogram can be written as:

The area of a parallelogram is expressed in square units. For example, if the base and height are measured in inches, the area will be in square inches $(in^{2})$.

## How to Find the Area of a Parallelogram

The area of a parallelogram can be calculated in the following cases:

1. When the base and height are known.

2. When the angle between the adjacent sides and their lengths are known.

3. When the two diagonals and any of the angles at which they intersect are known.

Finding Area of Parallelogram Using Base and Height

Let’s say the base of the parallelogram is represented by ‘b‘ units and the height by ‘h‘ units.

The formula for the area of the parallelogram can be written as:

Area = base $\times$ height

Area = b $\times$ h (square units)

Example: In a parallelogram, if the base is 11 units and the height is 6 units, what is the area?

Solution:

Base of the parallelogram = 11 units

Height of the parallelogram = 6 units

Area of parallelogram = b $\times$ h = 11 $\times$ 6 = 66 square units of 66 $unit^{2}$

Finding Area of Parallelogram Using Lengths of Sides

The area of the parallelogram can also be calculated without height. Let the lengths of adjacent sides be ‘a’ units and ‘b’ units, and θ be the angle between them.

Area of parallelogram = a $\times$ b $\times$ sin(θ)

where ‘a’ and ‘b’ are the lengths of the adjacent sides,

θ is the angle between them.

This formula is derived from the fact that a parallelogram can be divided into two congruent triangles. By using the trigonometric relationship between the sides and angles of a triangle, we can calculate the area of each triangle and then sum them up to find the total area of the parallelogram.

Example: In a parallelogram, the lengths of the adjacent sides are 5 units and 8 units, and the angle between them is 60 degrees. Find the area of the parallelogram.

Solution:

a = 5 units, b = 8 units, θ = 60 degrees

Using the formula for the area of a parallelogram with adjacent sides and the angle between them:

Area = a $\times$ b $\times$ sin(θ)

Area =  5 $\times$ 8 $\times$ sin(60º)

Area = 40 $\times \frac{\sqrt{3}}{2}$

Area = $20\sqrt{3}$ square units

Therefore, the area of the parallelogram is $20\sqrt{3}$ square units.

Finding Area of Parallelogram Using Diagonals

To calculate the area of a parallelogram using the lengths of its diagonals, you can use the following two formulas:

Area = $\frac{1}{2} \times d_{1} \times d_{2} \times sin(x)$

Area = $\frac{1}{2} \times d_{1} \times d_{2} \times sin(y)$

where:

• d1 and d2 are the lengths of the diagonals of the parallelogram.
• x or y is the angle of intersection between the diagonals.

Example: In a parallelogram, the lengths of the diagonals are 6 units and 8 units, and the angle between the diagonals is 90 degrees. Find the area of the parallelogram.

d1= 6 units, d2 = 8 units, x = 90 degrees

Using the formula for the area of a parallelogram with the lengths of its diagonals:

Area = $\frac{1}{2} \times d_{1} \times d_{2} \times sin(x)$

Area = $\frac{1}{2} \times 6 \times 8 \times sin(90)$

Area $= \frac{1}{2} \times 6 \times 81 = 24$ square units

Therefore, the area of the parallelogram is 24 square units

## Facts about Area of a Parallelogram

• The area of a parallelogram is equal to the area of a triangle with the same base and height.
• In a parallelogram, opposite sides are parallel and equal. This means that you can use any side as the base and the corresponding height to calculate the area.
• Any parallelogram can be transformed into a rectangle with the same base and height. The area of the parallelogram remains unchanged during this transformation, which explains why the area formula for a parallelogram is the same as that for a rectangle.

## Conclusion

In this article, we have learned about the area of parallelogram.the area of a parallelogram is necessary for measurements, real-world applications, problem-solving, understanding geometric relationships, and as a stepping stone for further mathematical and professional pursuits. Let’s solve some examples and practice problems to understand the concept better.

## Solved Examples on the Area of Parallelogram

Example 1: A field has the shape of a parallelogram. The length of one side is 10 yards, and the corresponding height is 6 yards. Find the area of the field.

Solution:

One side of the parallelogram = 10 yards

Corresponding height = 6 yards

Area of a parallelogram = A = base $\times$ height.

Area = 10 yards $\times$ 6 yards = 60 square yards.

Therefore, the area of the field is 60 square yards.

Example 2: Calculate the area of a parallelogram whose diagonals are 15 units and 20 units, and the angle of intersection between the diagonals is 30°.

Solution:

Let d1 = 15 units and d2= 20 units.

Using the formula for the area of a parallelogram with the lengths of its diagonals:

Area = $\frac{1}{2} \times d_{1} \times d_{2} \times sin(x)$

Area = $\frac{1}{2} \times 15 \times 20 \times sin$(30°

Area = $\frac{1}{2} \times 15 \times 20 \times \frac{1}{2}$1

Area = $15 \times 5$

Area = 75 square units

Therefore, the area of the parallelogram is 75 square units.

Example 3: Find the area of a parallelogram when two parallel sides are 40 units and 20 units respectively and the angle between them is 60.

Solution:

Length of First Side = 40 units

Length of Second Side = 20 units

Angle between Both Sides = 60°

Using the Area of Parallelogram Formula,

Area = a $\times$ b $\times$ sin(θ)

Area of Parallelogram = 40 $\times$ 20 $\times$ sin(60°)

Area of Parallelogram = 800 $\times$ sin(60°

Area of Parallelogram = 800 $\times$ 0.866

Area of Parallelogram = 692.8 square units.

Thus, the area of the parallelogram is 692.8 square units.

## Practice Problems on the Area of Parallelogram

1

### What is the formula for finding the area of a parallelogram?

Area = base $\times$ height
Area = length $\times$ width
Area = $\frac{(base + height)}{2}$
Area = $\pi \times$ radius²
CorrectIncorrect
Correct answer is: Area = base $\times$ height
Area = base $\times$ height is the formula specifically used to calculate the area of a parallelogram.
2

### In a parallelogram, which sides are used to determine the base and height for calculating the area?

Opposite sides
Diagonal sides
All sides have the same role
CorrectIncorrect
The base of a parallelogram is one of the parallel sides, and the height is the perpendicular distance between the base and the opposite parallel side.
3

### Which of the following CAN NOT be used to calculate the area of a parallelogram?

Base and height
Length of adjacent sides and angle between them
Perimeter of the parallelogram
Diagonals and angle between them
CorrectIncorrect
Correct answer is: Perimeter of the parallelogram
We cannot calculate the area of a parallelogram using its perimeter.
4

### If the base of a parallelogram is 8 units and the height is 10 units, what is the area?

13 square units
80 square units
40 square units
45 square units
CorrectIncorrect
Correct answer is: 80 square units
Area = base $\times$ height = 8 $\times$ 10 = 80 square units
5

### Two parallelograms have the same height, but one has a base twice as long as the other. How does the area of the larger parallelogram compare to the smaller one?

It is half the area of the smaller parallelogram.
It is equal to the area of the smaller parallelogram.
It is twice the area of the smaller parallelogram.
It is four times the area of the smaller parallelogram.
CorrectIncorrect
Correct answer is: It is twice the area of the smaller parallelogram.
Area of the smaller parallelogram = base $\times$ height = bh
Area of the larger parallelogram = (2 $\times$ base) $\times$ height = 2bh = Twice the area of the smaller parallelogram

## Frequently Asked Questions on the Area of Parallelogram

Yes, any of the parallel sides can be chosen as the base.

The height is the perpendicular distance between the base and the opposite parallel side.

If the base of a parallelogram is doubled while the height remains the same, the area will also be doubled.

If the height of a parallelogram is halved while the base remains the same, the area will be halved.