Area of Parallelogram Practice Problems and Solutions

Master parallelogram area calculations with step-by-step practice problems. Learn formulas, work through examples, and build confidence in geometry.

📚What You'll Master in This Practice Session
  • Apply the area formula A = base × height to solve parallelogram problems
  • Calculate missing dimensions when given area and one measurement
  • Identify correct base-height pairs in parallelogram diagrams
  • Solve complex problems involving parallelograms with external heights
  • Work with ratios and proportions in parallelogram area calculations
  • Distinguish between different types of parallelograms (rectangle, rhombus, square)

Understanding Area of a Parallelogram

Complete explanation with examples

How is the area of a parallelogram calculated?

We can calculate the area of a parallelogram by multiplying one of its sides by its relative height.

To understand it better, we can use the following figure and the accompanying formula:

A=DC×H1=BC×H2 A=DC\times H1=BC\times H2

It can be seen that: H1 H1 and H2 H2 are the two heights corresponding to the bases DC DC and BC BC respectively.

Area of a Parallelogram

A5 - Parallelogram area formula

Detailed explanation

Practice Area of a Parallelogram

Test your knowledge with 23 quizzes

AB = 12 cm

The height of the rectangle is 4 cm.

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Calculate the area of the parallelogram.

Examples with solutions for Area of a Parallelogram

Step-by-step solutions included
Exercise #1

A parallelogram has a length equal to 6 cm and a height equal to 4.5 cm.

Calculate the area of the parallelogram.

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Step-by-Step Solution

To solve this problem, let's apply the formula for the area of a parallelogram:

The formula for the area of a parallelogram is Area=base×height \text{Area} = \text{base} \times \text{height} .

Here, the base of the parallelogram is 6 cm, and the height is 4.5 cm.

Substituting these values into the formula gives:

Area=6×4.5 \text{Area} = 6 \times 4.5

Performing the multiplication:

Area=27 \text{Area} = 27 square centimeters.

Therefore, the area of the parallelogram is 27cm2 27 \, \text{cm}^2 .

Referring to the given multiple-choice answers, the correct choice is:

Choice 3: 27 27 .

Answer:

27

Video Solution
Exercise #2

AB = 5 cm

The height of the rectangle is 2 cm.

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Calculate the area of the parallelogram.

Step-by-Step Solution

To find the area of the parallelogram, we will follow these steps:

  • Identify the base and the corresponding height.
  • Use the formula for the area of a parallelogram.
  • Perform the calculation to find the area.

Let's execute these steps:

Step 1: Identify the given measurements. The base AB=5cm AB = 5 \, \text{cm} , and the height corresponding to it is 2cm 2 \, \text{cm} .

Step 2: Apply the formula for the area of a parallelogram, which is A=b×h A = b \times h .

Step 3: Substitute the known values into the formula:
A=5cm×2cm=10cm2 A = 5 \, \text{cm} \times 2 \, \text{cm} = 10 \, \text{cm}^2

Therefore, the area of the parallelogram is 10cm2 10 \, \text{cm}^2 .

Answer:

10

Video Solution
Exercise #3

AB = 6 cm

The height of the rectangle is 2 cm.

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Calculate the area of the parallelogram.

Step-by-Step Solution

To solve this problem, we'll calculate the area of the parallelogram using the following steps:

  • Step 1: Identify the base and the height from the given information.
  • Step 2: Use the formula for the area of a parallelogram: Area=base×height \text{Area} = \text{base} \times \text{height} .
  • Step 3: Substitute the values and compute the area.

Now, let's perform these steps:

Step 1: The base ABAB is given as 6 cm, and the height perpendicular to this base is 2 cm.

Step 2: Using the formula for the area of a parallelogram, we have:

Area=base×height\text{Area} = \text{base} \times \text{height}

Step 3: Substituting the given values:

Area=6cm×2cm=12cm2\text{Area} = 6 \, \text{cm} \times 2 \, \text{cm} = 12 \, \text{cm}^2

Thus, the area of the parallelogram is 12 square centimeters.

The correct answer is choice 1: 12.

Answer:

12

Video Solution
Exercise #4

AB = 17 cm

The height of the rectangle is 8 cm.

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Calculate the area of the parallelogram.

Step-by-Step Solution

To solve this problem, we will calculate the area of the parallelogram using the given base and height dimensions.

  • Step 1: Identify the given parameters. The base of the parallelogram AB=17cm AB = 17 \, \text{cm} and the corresponding height is 8cm 8 \, \text{cm} .
  • Step 2: Apply the area formula for parallelograms: Area=base×height\text{Area} = \text{base} \times \text{height}.
  • Step 3: Substitute the given values into the formula: Area=17×8 \text{Area} = 17 \times 8 .

Calculating the product, we have:
Area=136cm2 \text{Area} = 136 \, \text{cm}^2 .

Therefore, the area of the parallelogram is 136cm2 136 \, \text{cm}^2 .

Answer:

136

Video Solution
Exercise #5

Calculate the area of the parallelogram using the data in the figure:

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Step-by-Step Solution

From the given constraints, it is impossible to confidently compute the area of the parallelogram because of insufficient and unclear relationships between provided figures and the calculations they must produce. Clarity on which numbers correspond to the height and base—as or any definitional angles—is absent.

The correct answer, aligning with acknowledged drawing limitations, is: It is not possible to calculate.

Answer:

It is not possible to calculate.

Video Solution

Frequently Asked Questions

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

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The area of a parallelogram is calculated using the formula A = base × height, where the height must be perpendicular to the chosen base. You can use any side as the base, but you must use its corresponding perpendicular height.

How do I identify the height of a parallelogram in a diagram?

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The height is always the perpendicular distance between two parallel sides. Look for: 1) A line segment drawn at a 90° angle to the base, 2) Dashed lines indicating perpendicular measurements, 3) Right angle symbols (small squares) showing where height meets the base.

Can I use any side as the base when calculating parallelogram area?

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Yes, you can use any side as the base. However, you must use the height that corresponds to that specific base - the perpendicular distance to the opposite parallel side. Different base-height pairs should give the same area result.

What's the difference between a parallelogram's side length and its height?

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A parallelogram's side length is the actual length of one of its four sides, while the height is the perpendicular distance between parallel sides. The height is usually shorter than the slanted sides and forms a 90° angle with the base.

How do I solve parallelogram area problems with missing measurements?

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Use the area formula A = base × height and substitute known values. For missing dimensions: 1) Rearrange the formula (height = area ÷ base, or base = area ÷ height), 2) Use properties like opposite sides being equal, 3) Apply given ratios or relationships between measurements.

What are common mistakes when calculating parallelogram area?

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Common errors include: • Using a side length instead of the perpendicular height • Confusing slant height with perpendicular height • Not checking that both base-height calculations give the same area • Forgetting that opposite sides of parallelograms are equal

How is parallelogram area different from rectangle or square area?

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While rectangles and squares use length × width, parallelograms require base × perpendicular height because their sides are slanted. Rectangles and squares are special parallelograms where all angles are 90°, making side length equal to height.

What real-world applications use parallelogram area calculations?

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Parallelogram area is used in: architecture for calculating sloped roof areas, engineering for determining material needs for angled structures, graphic design for layout planning, and construction for estimating flooring or tiling for non-rectangular spaces.

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