The formula to calculate the perimeter of a parallelogram

You have probably already realized that it is not necessary to calculate all the edge lengths to find the perimeter.

Let's look at the parallelogram ABCD ABCD :

The equal edges are marked with the letters a a and b b . Let's note the perimeter of the parallelogram:
P=a+a+b+b=2a+2B=2(a+b) P=a+a+b+b=2a+2B=2\left(a+b\right)

Now let's do it in a clear way.

The formula to calculate the perimeter of a parallelogram is:
P=2a+2b P=2a+2b

or
P=2(a+b) P=2(a+b)

There is no difference between both formulas, we can use whichever we want.

A6 - Perimeter of a parallelogram

The perimeter of the parallelogram is equal to the sum of its four edges (or sides). As we know, in a parallelogram there are two pairs of opposite edges of equal length, therefore, knowing the length of two adjacent sides is enough to calculate the perimeter of the figure.

For example, if we observe the parallelogram ABCD ABCD , given the length of its sides in cm:

As we have mentioned, the perimeter is the sum of the length of its sides. Consequently, we will note:

A1 - The perimeter of the parallelogram = P=3+4+3+4=14

P=3+4+3+4=14 P=3+4+3+4=14

Solution: The perimeter of the parallelogram is 14cm 14cm .

Suggested Topics to Practice in Advance

  1. Area
  2. Parallelogram
  3. The area of a parallelogram: what is it and how is it calculated?
  4. Areas of Polygons for 7th Grade
  5. How do we calculate the area of complex shapes?

Practice Perimeter of a Parallelogram

Examples with solutions for Perimeter of a Parallelogram

Exercise #1

666444AAABBBDDDCCC

Calculate the perimeter of the given parallelogram:

Video Solution

Step-by-Step Solution

As is true for a parallelogram every pair of opposite sides are equal:

AB=CD=6,AC=BD=4 AB=CD=6,AC=BD=4

The perimeter of the parallelogram is equal to the sum of all sides together:

4+4+6+6=8+12=20 4+4+6+6=8+12=20

Answer

20

Exercise #2

Given the parallelogram:

888333AAABBBDDDCCC

Calculate the perimeter of the parallelogram.

Video Solution

Step-by-Step Solution

To solve this problem, let's follow these steps:

  • Step 1: Identify the lengths of the adjacent sides of the parallelogram.
  • Step 2: Use the formula for the perimeter of a parallelogram, P=2(a+b) P = 2(a + b) .
  • Step 3: Plug in the known values and calculate the perimeter.

Now, let's work through each step:

Step 1: From the diagram, we have two adjacent sides of the parallelogram: a=8 a = 8 units and b=3 b = 3 units.

Step 2: The formula for the perimeter of a parallelogram is given by P=2(a+b) P = 2(a + b) .

Step 3: Substitute the values for a a and b b into the formula:

P=2(8+3)=2×11=22 P = 2(8 + 3) = 2 \times 11 = 22 .

Therefore, the perimeter of the parallelogram is 22 22 .

Answer

22

Exercise #3

Given the parallelogram:

555444AAABBBDDDCCC

Calculate the perimeter of the parallelogram.

Video Solution

Step-by-Step Solution

To solve the problem of calculating the perimeter of the parallelogram, follow these steps:

  • Identify the given side lengths: AB=5 AB = 5 and AC=4 AC = 4 .
  • Acknowledge that in a parallelogram, opposite sides are equal, so AB=CD=5 AB = CD = 5 and AC=BD=4 AC = BD = 4 .
  • Apply the perimeter formula for a parallelogram: P=2×(Base+Side) P = 2 \times ( \text{Base} + \text{Side} ) .

Plug the known side lengths into the formula:
P=2×(AB+AC)=2×(5+4)=2×9=18 P = 2 \times (AB + AC) = 2 \times (5 + 4) = 2 \times 9 = 18

Thus, the perimeter of the parallelogram is 18 18 .

Answer

18

Exercise #4

101010777AAABBBDDDCCC

Calculate the perimeter of the given parallelogram.

Video Solution

Step-by-Step Solution

As is true for a parallelogram each pair of opposite sides are equal and parallel,

Therefore it is possible to argue that:

AC=BD=7 AC=BD=7

AB=CD=10 AB=CD=10

Now we can calculate the perimeter of the parallelogram by adding together all of its sides:

10+10+7+7=20+14=34 10+10+7+7=20+14=34

Answer

34

Exercise #5

Given the parallelogram:

555222AAABBBDDDCCC

Calculate the perimeter of the parallelogram.

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the given side lengths of the parallelogram.
  • Step 2: Apply the perimeter formula for a parallelogram.
  • Step 3: Perform the calculation with the identified side lengths.

Now, let's work through each step:
Step 1: The problem gives us the side lengths of the parallelogram as AB=5 AB = 5 and BC=2 BC = 2 . Since opposite sides are equal in a parallelogram, we have AB=CD=5 AB = CD = 5 and BC=DA=2 BC = DA = 2 .
Step 2: We'll use the formula for the perimeter of a parallelogram: P=2(a+b) P = 2(a + b) .
Step 3: Substituting the values, we have:

P=2(5+2)=2×7=14 P = 2(5 + 2) = 2 \times 7 = 14

Therefore, the perimeter of the parallelogram is 14\boxed{14}.

The correct multiple-choice answer is 14, which corresponds to choice number 2.

Answer

14

Exercise #6

Given the parallelogram:

999333AAABBBDDDCCC

Calculate the perimeter of the parallelogram.

Video Solution

Step-by-Step Solution

To determine the perimeter of the parallelogram, we need first to identify the lengths of the sides:

  • From the problem, one side (aa) is 99 units, and an adjacent side (bb) is 33 units.

Using the formula for the perimeter of a parallelogram, P=2(a+b) P = 2(a + b) , we can substitute the known values:

  • a=9 a = 9
  • b=3 b = 3

Substituting these values into the formula gives us:

P=2(9+3) P = 2(9 + 3)

P=2×12 P = 2 \times 12

P=24 P = 24

Therefore, the perimeter of the parallelogram is 24 24 .

Answer

24

Exercise #7

Given the parallelogram:

151515101010AAABBBDDDCCC

Calculate the perimeter of the parallelogram.

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the given side lengths
  • Step 2: Use the perimeter formula for a parallelogram
  • Step 3: Perform the calculation to find the perimeter

Now, let's work through each step:
Step 1: The problem tells us that the lengths of two adjacent sides of the parallelogram are 15 and 10.
Step 2: We'll use the formula for the perimeter of a parallelogram, which is P=2(a+b) P = 2(a + b) , where a a and b b are the two sides.
Step 3: Plugging in the values, we have P=2(15+10)=2×25=50 P = 2(15 + 10) = 2 \times 25 = 50 .

Therefore, the perimeter of the parallelogram is 50 50 .

Answer

50

Exercise #8

Given the parallelogram:

101010888AAABBBDDDCCC

Calculate the perimeter of the parallelogram.

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the lengths of the sides of the parallelogram.
  • Step 2: Apply the perimeter formula for a parallelogram.
  • Step 3: Perform the necessary calculations.

Now, let's work through each step:
Step 1: The given information tells us that one side AB AB is 10 10 , and the adjacent side AC AC is 8 8 .
Step 2: The perimeter P P of a parallelogram is given by the formula P=2×(base+side) P = 2 \times (\text{base} + \text{side}) .
Step 3: We substitute the lengths we have: P=2×(10+8)=2×18=36 P = 2 \times (10 + 8) = 2 \times 18 = 36

Therefore, the perimeter of the parallelogram is 36 36 .

Answer

36

Exercise #9

Given the parallelogram:

888666AAABBBDDDCCC

Calculate the perimeter of the parallelogram.

Video Solution

Step-by-Step Solution

To calculate the perimeter of the parallelogram ABCD, we need the lengths of its two adjacent sides. Given that one side, AB, is 8 units, and recalling that adjacent parallelogram sides will mirror their opposites, AC represents a relevant measurement within the context—but sides not involved with inclination describe standard periphery bounds without adjustments (hence reliance on visually positioned evaluation without contradictions).

Following the perimeter formula for parallelograms:

P=2(a+b) P = 2(a + b)

In our shape, let’s define:

  • a=8 a = 8 (Length of side AB or its opposite estimation feature equated)
  • b=6 b = 6 (Instinctive reconfirmation according to positive iteration; i.e., default parameter for spatial definition)

Plugging these values into our formula, we get:

P=2(8+6) P = 2(8 + 6) P=2(14) P = 2(14) P=28 P = 28

Therefore, the perimeter of the parallelogram is 28 28 units.

Answer

28

Exercise #10

Given the parallelogram:

202020151515AAABBBDDDCCC

Calculate the perimeter of the parallelogram.

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the given side lengths of the parallelogram.
  • Step 2: Use the perimeter formula for a parallelogram, P=2(a+b) P = 2(a + b) .
  • Step 3: Perform the calculation to find the perimeter.

Let's proceed with the solution:

Step 1: The problem provides the side lengths of the parallelogram as AB=20 AB = 20 units and AD=15 AD = 15 units.

Step 2: Use the formula for the perimeter of a parallelogram, P=2(a+b) P = 2(a + b) , where a=20 a = 20 and b=15 b = 15 .

Step 3: Plug the side lengths into the formula:

P=2(20+15)=2×35 P = 2(20 + 15) = 2 \times 35

Calculating further, we get:

P=70 P = 70

Therefore, the perimeter of the parallelogram is 70 70 .

Answer

70

Exercise #11

Given the parallelogram:

171717131313AAABBBDDDCCC

Calculate the perimeter of the parallelogram.

Video Solution

Step-by-Step Solution

To find the perimeter of the parallelogram, we apply the formula P=2(a+b) P = 2(a + b) , where a a and b b are the lengths of adjacent sides.

Step-by-step:

  • Step 1: Identify the side lengths. From the given problem, a=17 a = 17 and b=13 b = 13 .
  • Step 2: Use the perimeter formula P=2(a+b) P = 2(a + b) .
  • Step 3: Substitute the given values into the formula.

Calculation:

P=2(17+13) P = 2(17 + 13)

P=2×30 P = 2 \times 30

P=60 P = 60

Therefore, the perimeter of the parallelogram is 60 60 .

Answer

60

Exercise #12

Given the parallelogram:

6.56.56.5AAABBBDDDCCC4.5

Calculate the perimeter of the parallelogram.

Video Solution

Step-by-Step Solution

To determine the perimeter of the parallelogram, follow these steps:

  • Step 1: Note the given side lengths of the parallelogram. Side AB=6.5AB = 6.5 and side AD=4.5AD = 4.5.
  • Step 2: Apply the perimeter formula for a parallelogram: P=2(a+b)P = 2(a + b), where aa and bb are the lengths of two adjacent sides.
  • Step 3: Substitute the given lengths into the formula:

P=2×(6.5+4.5) P = 2 \times (6.5 + 4.5)

Step 4: Perform the addition inside the parentheses: 6.5+4.5=11 6.5 + 4.5 = 11

Step 5: Multiply the sum by 2 to find the perimeter: P=2×11=22 P = 2 \times 11 = 22

Therefore, the solution to the problem is that the perimeter of the parallelogram is P=22 P = 22 .

Upon reviewing the choices, the correct answer is choice 4: 22.

Answer

22

Exercise #13

Given the parallelogram:

141414111111AAABBBDDDCCC

Calculate the perimeter of the parallelogram.

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the side lengths of the parallelogram.
  • Step 2: Apply the perimeter formula for a parallelogram.
  • Step 3: Calculate the perimeter using the given side lengths.

Now, let's work through each step:
Step 1: The side lengths given are a=14 a = 14 and b=11 b = 11 .
Step 2: Apply the formula for the perimeter of a parallelogram, which is P=2(a+b) P = 2(a + b) .
Step 3: Substitute the values into the formula: P=2(14+11)=2×25=50 P = 2(14 + 11) = 2 \times 25 = 50 .

Therefore, the solution to the problem is P=50 P = 50 .

Answer

50

Exercise #14

Given the parallelogram:

111111777AAABBBDDDCCC

Calculate the perimeter of the parallelogram.

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the given side lengths of the parallelogram.
  • Step 2: Apply the formula for the perimeter of a parallelogram.
  • Step 3: Calculate the perimeter using the identified side lengths.

Now, let's work through each step:
Step 1: The problem states that the lengths of sides AB and BC in the parallelogram are 11 and 7 units, respectively.
Step 2: The formula for the perimeter P P of a parallelogram is P=2×(side 1+side 2) P = 2 \times (\text{side 1} + \text{side 2}) .
Step 3: Substituting the given lengths into the formula, we have:
P=2×(11+7)=2×18=36 P = 2 \times (11 + 7) = 2 \times 18 = 36 .

Therefore, the perimeter of the parallelogram is 36\mathbf{36} units.

Answer

36

Exercise #15

Given the parallelogram:

444222AAABBBDDDCCC

Calculate the perimeter of the parallelogram.

Video Solution

Step-by-Step Solution

To find the perimeter of the parallelogram, we follow these steps:

  • Step 1: Identify the given side lengths from the diagram: AB=4 AB = 4 units and AD=2 AD = 2 units.
  • Step 2: Use the perimeter formula for a parallelogram, which is P=2(a+b) P = 2(a + b) .
  • Step 3: Substituting the given values into the formula: a=4 a = 4 and b=2 b = 2 .

Proceeding with the calculation:

P=2(4+2)=2×6=12 P = 2(4 + 2) = 2 \times 6 = 12 .

Therefore, the perimeter of the parallelogram is 12 units.

Answer

12