Perimeter of a trapezoid

The trapezoid is a quadrilateral defined as having 2 parallel opposite sides. The calculation of the perimeter of the trapezoid is solved using a very simple formula that we will see below: all sides are added together. This type of questions can appear in tests of the first and second level in the first years of high school and also in final exams of level 3, 4 and 5 for the graduation of the secondary cycle.

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Suggested Topics to Practice in Advance

  1. Area
  2. Trapezoids
  3. Area of a trapezoid
  4. Areas of Polygons for 7th Grade
  5. Area of a right-angled trapezoid
  6. Area of an isosceles trapezoid
  7. How do we calculate the area of complex shapes?

Practice Perimeter of a Trapezoid

Examples with solutions for Perimeter of a Trapezoid

Exercise #1

Look at the trapezoid in the diagram.

101010777121212777

What is its perimeter?

Video Solution

Step-by-Step Solution

In order to calculate the perimeter of the trapezoid we must add together the measurements of all of its sides:

7+10+7+12 =

36

And that's the solution!

Answer

36

Exercise #2

Given the trapezoid:

444999666131313

What is its perimeter?

Video Solution

Step-by-Step Solution

The problem requires calculating the perimeter of the trapezoid by summing the lengths of its sides. Based on the given trapezoid diagram, the side lengths are clearly marked as follows:

  • First side: 4 4
  • Second side: 9 9
  • Third side: 6 6
  • Fourth side: 13 13

According to the formula for the perimeter of a trapezoid:

P=a+b+c+d P = a + b + c + d

Substituting the respective values:

P=4+9+6+13 P = 4 + 9 + 6 + 13

Calculating the sum, we find:

P=32 P = 32

Thus, the perimeter of the trapezoid is 32 32 .

Answer

32

Exercise #3

What is the perimeter of the trapezoid in the figure?

444555999666

Video Solution

Step-by-Step Solution

To find the perimeter we will add all the sides:

4+5+9+6=9+9+6=18+6=24 4+5+9+6=9+9+6=18+6=24

Answer

24

Exercise #4

What is the perimeter of the trapezoid in the figure?

7.57.57.54441.51.51.5333

Video Solution

Step-by-Step Solution

To find the perimeter of the trapezoid, we will sum the lengths of all its sides. The given side lengths are:

  • Base 1: 7.5 7.5
  • Base 2: 1.5 1.5
  • Leg 1: 3 3
  • Leg 2: 4 4

Using the formula for the perimeter P P of the trapezoid, we have:

P=a+b+c+d P = a + b + c + d

Substituting in the given values:

P=7.5+1.5+3+4 P = 7.5 + 1.5 + 3 + 4

Performing the addition:

P=7.5+1.5=9 P = 7.5 + 1.5 = 9

P=9+3=12 P = 9 + 3 = 12

P=12+4=16 P = 12 + 4 = 16

Therefore, the perimeter of the trapezoid is 16 16 .

Answer

16

Exercise #5

Look at the trapezoid in the figure.

Calculate its perimeter.

2.52.52.510.410.410.45.35.35.3666

Video Solution

Step-by-Step Solution

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

  • Step 1: Identify all given side lengths of the trapezoid.
  • Step 2: Apply the formula for the perimeter of the trapezoid.
  • Step 3: Sum up the lengths to find the perimeter.

Now, let's work through each step:
Step 1: The problem gives us the lengths of the trapezoid's sides:
- AB=2.5 AB = 2.5
- BC=10.4 BC = 10.4
- CD=5.3 CD = 5.3
- DA=6 DA = 6

Step 2: We use the formula for the perimeter of a trapezoid:

P=AB+BC+CD+DA P = AB + BC + CD + DA

Step 3: Plugging in the given values, we calculate:

P=2.5+10.4+5.3+6 P = 2.5 + 10.4 + 5.3 + 6

Calculating further, we have:

P=24.2 P = 24.2

Therefore, the perimeter of the trapezoid is 24.2 24.2 .

Answer

24.2

Exercise #6

AB = 5

CD = 7

AC = 4

BD = 4

Calculate the perimeter of the rectangle.

555444777444AAABBBDDDCCC

Video Solution

Step-by-Step Solution

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

  • Step 1: Identify the given measurements for the sides.

  • Step 2: Use the perimeter formula for a trapezoid, which is summing all sides.

  • Step 3: Add the values to get the perimeter.

Now, let's work through each step:

Step 1: The problem gives us four sides to consider. These sides are: AB=5 AB = 5 , CD=7 CD = 7 , AC=4 AC = 4 , and BD=4 BD = 4 .

Step 2: The perimeter of a trapezoid or any quadrilateral is simply the sum of all four sides. Hence, we need to add AB AB , CD CD , AC AC , and BD BD .

Step 3: Adding the values, we calculate the perimeter:AB+CD+AC+BD=5+7+4+4=20 AB + CD + AC + BD = 5 + 7 + 4 + 4 = 20 .

Therefore, the perimeter of the given shape is 20 20 .

Answer

20

Exercise #7

AB = 10.5

CD = 13

AC = 7.5

BD = 7.5

Calculate the perimeter of the rectangle ABCD.

10.510.510.57.57.57.51313137.57.57.5AAABBBDDDCCC

Video Solution

Step-by-Step Solution

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

  • Step 1: Gather the given side lengths of quadrilateral ABCD.

  • Step 2: Since it's necessary to understand summation, add all lengths.

  • Step 3: Conclude from sum.

Now, let's work through each step:

Step 1: The problem provides:
ABamp;=10.5,CDamp;=13,ACamp;=7.5,BDamp;=7.5. \begin{aligned} AB &= 10.5, \\ CD &= 13, \\ AC &= 7.5, \\ BD &= 7.5. \end{aligned}

Step 2: Add them together:
Perimeteramp;=AB+CD+AC+BDamp;=10.5+13+7.5+7.5. \begin{aligned} \text{Perimeter} &= AB + CD + AC + BD \\ &= 10.5 + 13 + 7.5 + 7.5. \end{aligned}

Step 3: Calculate: Perimeteramp;=10.5+13+7.5+7.5=38.5. \begin{aligned} \text{Perimeter} &= 10.5 + 13 + 7.5 + 7.5 = 38.5. \end{aligned}

Therefore, the solution is that the perimeter of quadrilateral ABCD is 38.5 38.5 .

Answer

38.5

Exercise #8

Calculate the perimeter of the trapezoid according to the following data:

777101010777121212AAABBBCCCDDD

Video Solution

Step-by-Step Solution

To solve this problem, we'll calculate the perimeter of the trapezoid by summing the lengths of all its sides. The steps are as follows:

  • List the lengths of the sides: the bases are 1010 and 1212, and the two non-parallel sides are each 77.
  • Apply the perimeter formula for a trapezoid: P=a+b+c+d P = a + b + c + d .
  • Substitute the given values into the formula: P=10+12+7+7 P = 10 + 12 + 7 + 7 .
  • Calculate the sum: P=10+12+7+7=36 P = 10 + 12 + 7 + 7 = 36 .

Therefore, the perimeter of the trapezoid is 36 36 .

This matches the correct answer choice from the provided options.

Answer

36

Exercise #9

Calculate the perimeter of the trapezoid below:

999555121212444

Step-by-Step Solution

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

  • Step 1: Identify the given side lengths of the trapezoid.
  • Step 2: Use the perimeter formula for a trapezoid, which is the sum of the lengths of its sides.
  • Step 3: Perform the necessary addition to compute the perimeter.

Now, let's work through each step:
Step 1: The trapezoid has side lengths of 99, 55, 1212, and 44.
Step 2: The formula for the perimeter PP of a trapezoid is:
P=side1+side2+side3+side4 P = \text{side}_1 + \text{side}_2 + \text{side}_3 + \text{side}_4
Step 3: Plugging in the values, we compute:
P=9+5+12+4 P = 9 + 5 + 12 + 4
Step 4: Calculating the sum:
P=30 P = 30

Therefore, the perimeter of the trapezoid is 3030.

Answer

30

Exercise #10

Calculate the perimeter of the trapezoid below:

161616161616111151515

Step-by-Step Solution

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

  • Identify the given side lengths of the trapezoid.
  • Apply the formula for the perimeter of a trapezoid.
  • Perform the addition of all side lengths to calculate the perimeter.

Let's work through each step:

Step 1: Identify the given side lengths. The trapezoid has:

  • Top base: a=16 a = 16
  • Bottom base: b=1 b = 1
  • Non-parallel side: c=15 c = 15
  • Other non-parallel side: d=16 d = 16

Step 2: We'll use the formula for the perimeter of a trapezoid:

P=a+b+c+d P = a + b + c + d

Step 3: Plug in the values and perform the calculation:

P=16+1+15+16 P = 16 + 1 + 15 + 16

P=48 P = 48

Therefore, the perimeter of the trapezoid is 48 48 .

Answer

48

Exercise #11

Calculate the perimeter of the trapezoid below:

101010111111555101010

Step-by-Step Solution

To solve this problem, we'll calculate the perimeter of the trapezoid by summing the lengths of its sides:

  • Step 1: Identify the side lengths of the trapezoid:
    Top side =10 = 10 , Bottom side =5 = 5 , Left side =10 = 10 , Right side =11 = 11 .
  • Step 2: Apply the perimeter formula:
    The formula for the perimeter P P of a trapezoid is P=a+b+c+d P = a + b + c + d .
  • Step 3: Perform the calculations:
    Substitute the given lengths into the formula:
    P=10+5+10+11=36 P = 10 + 5 + 10 + 11 = 36 .

Therefore, the perimeter of the trapezoid is 36 36 .

Answer

36

Exercise #12

Below is an isosceles trapezoid:

101010121212666 What is its perimeter?

Video Solution

Step-by-Step Solution

To calculate the perimeter of the isosceles trapezoid, we follow these steps:

  • Identify the lengths of all the sides.
  • Sum these lengths to find the perimeter.

Now, let's apply these steps:
Step 1: The given lengths of the trapezoid are:
- Base 1 = 1010,
- Base 2 = 1212,
- Each leg = 66.

Step 2: Using the perimeter formula P=a+b+c+d P = a + b + c + d , we get:
P=10+12+6+6 P = 10 + 12 + 6 + 6 .

Step 3: Adding these values, we find:
P=34 P = 34 .

Therefore, the perimeter of the isosceles trapezoid is 34 34 .

Answer

34

Exercise #13

The drawing shows an isosceles trapezoid.

What is its perimeter?

333555777

Video Solution

Step-by-Step Solution

To find the perimeter of the isosceles trapezoid, consider the following steps:

  • Step 1: Identify the given side lengths: The top base of the trapezoid is 33, each of the slanted sides is 55, and the bottom base is 77.
  • Step 2: Apply the perimeter formula: The perimeter PP is the sum of all side lengths: P=3+5+5+7P = 3 + 5 + 5 + 7.
  • Step 3: Perform the calculation: Add the side lengths together:
    3+5+5+7=20 3 + 5 + 5 + 7 = 20

Therefore, the perimeter of the isosceles trapezoid is 2020.

Answer

20

Exercise #14

Look at the trapezoid in the figure.

The long base is 1.5 times longer than the short base.

Find the perimeter of the trapezoid.

222333555

Video Solution

Step-by-Step Solution

First, we calculate the long base from the existing data:

Multiply the short base by 1.5:

5×1.5=7.5 5\times1.5=7.5

Now we will add up all the sides to find the perimeter:

2+5+3+7.5=7+3+7.5=10+7.5=17.5 2+5+3+7.5=7+3+7.5=10+7.5=17.5

Answer

17.5

Exercise #15

Look at the trapezoid in the figure.

Express the perimeter of the trapezoid using the given variables.

5X5X5X3X3X3XZZZ3Y3Y3Y

Video Solution

Step-by-Step Solution

To solve this problem, we'll express the perimeter of the trapezoid by summing up its side lengths:

  • Step 1: Identify the given side lengths.

  • Step 2: Apply the perimeter formula for the trapezoid.

  • Step 3: Simplify the resulting expression.

Let's work through these steps:

Step 1: The trapezoid has the following side lengths:
- Top base: 5X5X
- Left side: 3X3X
- Bottom base: ZZ
- Right side: 3Y3Y

Step 2: Apply the perimeter formula:
The perimeter P P is given by the sum of all sides:
\begin{equation} P=5X+3X+Z+3Y P = 5X + 3X + Z + 3Y

Step 3: Simplify the expression:
Combine like terms:
P=(5X+3X)+Z+3Y=8X+3Y+Z P = (5X + 3X) + Z + 3Y = 8X + 3Y + Z

Therefore, the perimeter of the trapezoid is expressed as 8X+3Y+Z 8X + 3Y + Z .

Answer

8X+3Y+Z