Parallelogram Practice Problems & Exercises with Solutions

Master parallelogram properties, angle calculations, and verification methods with step-by-step practice problems. Perfect for geometry students learning quadrilaterals.

📚What You'll Master in This Parallelogram Practice
  • Identify and apply properties of parallelograms including opposite sides and angles
  • Calculate unknown angles using alternate interior and corresponding angle relationships
  • Verify if quadrilaterals are parallelograms using four different proof methods
  • Solve for missing side lengths and diagonal measurements in parallelograms
  • Apply parallelogram properties to find perimeter and area calculations
  • Master diagonal intersection properties and bisection theorems

Understanding Parallelogram

Complete explanation with examples

Parallelogram

Parallelogram is a four-sided polygon (quadrilateral) where opposite sides are parallel and equal in length. A key feature of parallelograms is that they have two sets of parallel lines, which gives them their name. Examples of parallelograms include squares, rectangles, and rhombuses, which are all specific types of parallelograms with additional unique properties.

Characteristics of the Parallelogram

  • Sides opposite in a quadrilateral: are sides that do not have a common meeting point.
  • Adjacent sides in a quadrilateral: are sides that have a common meeting point.
  • Adjacent angles: are 2 angles that have a common vertex and side.
  • Opposite angles in the quadrilateral are angles that do not have common sides.
  • Diagonal: is a section that connects 2 non-adjacent vertices (and is not a side)

If the data is:

  • ABǁCD AB ǁ CD
  • ADǁBC AD ǁ BC

Then: ABCD ABCD is a parallelogram

Parallelogram

A1 - Parallelogram KLMN

Detailed explanation

Practice Parallelogram

Test your knowledge with 44 quizzes

AB = 6 cm

The height of the rectangle is 2 cm.

AAABBBDDDCCC62

Calculate the area of the parallelogram.

Examples with solutions for Parallelogram

Step-by-step solutions included
Exercise #1

AB = 10 cm

The height of the rectangle is 5 cm.

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Calculate the area of the parallelogram.

Step-by-Step Solution

To solve this problem, we'll apply the formula for the area of a parallelogram:

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

Let's proceed with the solution:
Step 1: The given base AB AB is 10 cm, and the height is 5 cm.
Step 2: The formula for the area of a parallelogram is A=base×height A = \text{base} \times \text{height} .
Step 3: Substituting the provided values, we get:
A=10cm×5cm A = 10 \, \text{cm} \times 5 \, \text{cm}
A=50cm2 A = 50 \, \text{cm}^2

Therefore, the area of the parallelogram is 50cm2 50 \, \text{cm}^2 .

Answer:

50

Video Solution
Exercise #2

Calculate the area of the following parallelogram:

101010888101010888666

Step-by-Step Solution

To calculate the area of the parallelogram, we will simply apply the formula for the area of a parallelogram:

  • Identify the base: The length of the base is 10cm10 \, \text{cm}.
  • Identify the height: The perpendicular height is given as 6cm6 \, \text{cm}.

Apply the formula: Area=base×height \text{Area} = \text{base} \times \text{height} .

Substitute the known values: Area=10cm×6cm \text{Area} = 10 \, \text{cm} \times 6 \, \text{cm} .

Calculate the result: Area=60cm2 \text{Area} = 60 \, \text{cm}^2 .

Therefore, the area of the parallelogram is 60cm2 60 \, \text{cm}^2 .

Answer:

60 cm²

Video Solution
Exercise #3

AB = 12 cm

The height of the rectangle is 4 cm.

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Calculate the area of the parallelogram.

Step-by-Step Solution

To solve this problem, we'll proceed as follows:

  • Step 1: Identify the given values for the base and the height of the parallelogram.
  • Step 2: Apply the formula for calculating the area of the parallelogram.
  • Step 3: Calculate the area using the values provided.

Let's perform each step:

Step 1: From the problem, we know:

  • The base AB AB of the parallelogram is 12cm 12 \, \text{cm} .
  • The height relative to the base is 4cm 4 \, \text{cm} .

Step 2: Use the formula for the area of a parallelogram:

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

Step 3: Plugging in the values of the base and height:

Area=12×4=48cm2\text{Area} = 12 \times 4 = 48 \, \text{cm}^2

Therefore, the area of the parallelogram is 48cm2 48 \, \text{cm}^2 .

Since this is a multiple-choice problem, the correct answer is Choice 2.

Answer:

48

Video Solution
Exercise #4

AB = 15 cm

The height of the rectangle is 6 cm.

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Calculate the area of the parallelogram.

Step-by-Step Solution

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

  • Step 1: Identify the given base and height.
  • Step 2: Apply the formula for the area of a parallelogram.
  • Step 3: Calculate the area using the provided dimensions.

Now, let's work through each step:
Step 1: The base b b is equal to the length AB AB , which is 15 cm\text{15 cm}. The height h h corresponding to this base is 6 cm\text{6 cm}.
Step 2: We'll use the formula for the area of a parallelogram:
Area=b×h\text{Area} = b \times h.
Step 3: Plugging in our values, we have:
Area=15×6=90cm2\text{Area} = 15 \times 6 = 90 \, \text{cm}^2.

Therefore, the solution to the problem is Area=90cm2 \text{Area} = 90 \, \text{cm}^2 , which matches choice .

Answer:

90

Video Solution
Exercise #5

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

Frequently Asked Questions

What are the 4 main properties of a parallelogram?

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The four main properties are: 1) Opposite sides are parallel and equal, 2) Opposite angles are equal, 3) Diagonals bisect each other, and 4) Adjacent angles are supplementary (add up to 180°).

How do you prove a quadrilateral is a parallelogram?

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You can prove a quadrilateral is a parallelogram using any of these methods: • Show both pairs of opposite sides are parallel • Prove both pairs of opposite sides are equal • Demonstrate both pairs of opposite angles are equal • Show diagonals bisect each other • Prove one pair of opposite sides is both parallel and equal

What is the difference between corresponding angles and alternate interior angles in parallelograms?

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Corresponding angles are in the same position at each intersection when a transversal crosses parallel lines. Alternate interior angles are on opposite sides of the transversal and inside the parallel lines, forming a 'Z' pattern. Both are equal when lines are parallel.

How do you find missing angles in a parallelogram?

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Use these steps: 1) Remember opposite angles are equal, 2) Adjacent angles are supplementary (add to 180°), 3) Apply alternate interior angle theorem for parallel sides, 4) Use the fact that all four angles sum to 360°.

What happens when diagonals of a parallelogram intersect?

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When diagonals of a parallelogram intersect, they bisect each other at the point of intersection. This means each diagonal is divided into two equal segments, creating four congruent triangles within the parallelogram.

Can a parallelogram have right angles?

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Yes, a parallelogram can have right angles. When all angles are 90°, it becomes a rectangle. A rectangle is a special type of parallelogram with additional properties like equal diagonals and four right angles.

How do you calculate the perimeter of a parallelogram?

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The perimeter formula is P = 2(a + b), where 'a' and 'b' are the lengths of adjacent sides. Since opposite sides are equal in a parallelogram, you only need to measure two adjacent sides and double their sum.

What are real-world examples of parallelograms?

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Common real-world parallelograms include: railway tracks forming parallelograms at intersections, rectangular picture frames, rhombus-shaped tiles, parallelogram-shaped building windows, and the quadrilateral formed by opposite pages in an open book.

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