In Euclidean geometry, a quadrilateral is a four-sided 2D figure whose sum of internal angles is 360°. The word quadrilateral is derived from two Latin words ‘quadri’ and ‘latus’ meaning four and side respectively. Therefore, identifying the properties of quadrilaterals is important when trying to distinguish them from other polygons. So, what are the properties of quadrilaterals? There are two properties of quadrilaterals:

- A quadrilateral should be closed shape with 4 sides
- All the internal angles of a quadrilateral sum up to 360°

In this article, you will get an idea about the 5 types of quadrilaterals (Rectangle, Square, Parallelogram, Rhombus, and Trapezium) and get to know about the properties of quadrilaterals.

Here are the five types of quadrilaterals discussed in this article:

- Rectangle
- Square
- Parallelogram
- Rhombus
- Trapezium

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Here is a video explaining the properties of quadrilaterals:

## Properties of the quadrilaterals – An overview

The diagram given below shows a quadrilateral ABCD and the sum of its internal angles. All the internal angles sum up to 360°. Thus, ∠A + ∠B + ∠C + ∠D = 360°

Properties of quadrilaterals |
Rectangle |
Square |
Parallelogram |
Rhombus |
Trapezium |

All Sides are equal | No | Yes | No | Yes | No |

Opposite Sides are equal | Yes | Yes | Yes | Yes | No |

Opposite Sides are parallel | Yes | Yes | Yes | Yes | Yes |

All angles are equal | Yes | Yes | No | No | No |

Opposite angles are equal | Yes | Yes | Yes | Yes | No |

Sum of two adjacent angles is 180 | Yes | Yes | Yes | Yes | No |

Bisect each other | Yes | Yes | Yes | Yes | No |

Bisect perpendicularly | No | Yes | No | Yes | No |

Let’s discuss each of these 5 quadrilaterals in detail:

## Rectangle

A rectangle is a quadrilateral with four right angles. Thus, all the angles in a rectangle are equal (360°/4 = 90°). Moreover, the opposite sides of a rectangle are parallel and equal, and diagonals bisect each other.

### Here are the three properties of a rectangle:

- All the angles of a rectangle are 90°
- Opposite sides of a rectangle are equal and Parallel
- Diagonals of a rectangle bisect each other

### Rectangle formula – area and perimeter of a rectangle

If the length of the rectangle is L and breadth is B then,

- Area of a rectangle = Length × Breadth or L × B
- Perimeter of rectangle = 2 × (L + B)

These practice questions will help you solidify the properties of rectangles

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## Square

Square is a quadrilateral with four equal sides and angles. It’s also a regular quadrilateral as both its sides and angles are equal. Just like a rectangle, a square has four angles of 90° each. It can also be seen as a rectangle whose two adjacent sides are equal.

### Here are the three properties of a Square:

- All the angles of a square are 90°
- All sides of a square are equal and parallel to each other
- Diagonals bisect each other perpendicularly

### Square formula – area and perimeter of a square

If the side of a square is ‘a’ then,

- Area of the square = a × a = a²
- Perimeter of the square = 2 × (a + a) = 4a

These practice questions will help you solidify the properties of squares

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## Parallelogram

A parallelogram, as the name suggests, is a simple quadrilateral whose opposite sides are parallel. Thus, it has two pairs of parallel sides. Moreover, the opposite angles in a parallelogram are equal and their diagonals bisect each other.

### Here are the four properties of a Parallelogram:

- Opposite angles are equal
- Opposite sides are equal and parallel
- Diagonals bisect each other
- Sum of any two adjacent angles is 180°

### Parallelogram formulas – area and perimeter of a parallelogram

If the length of a parallelogram is ‘l’, breadth is ‘b’ and height is ‘h’ then:

- Perimeter of parallelogram= 2 × (l + b)
- Area of the parallelogram = l × h

These practice questions will help you solidify the properties of parallelogram

## Rhombus

A rhombus is a quadrilateral whose all four sides are equal in length and opposite sides are parallel to each other. However, the angles are not equal to 90°. A rhombus with right angles would become a square. Another name for rhombus is ‘diamond’ as it looks similar to the diamond suit in playing cards.

### Here are the four properties of a Rhombus:

- Opposite angles are equal
- All sides are equal and, opposite sides are parallel to each other
- Diagonals bisect each other perpendicularly
- Sum of any two adjacent angles is 180°

### Rhombus formulas – area and perimeter of a rhombus

If the side of a rhombus is a then, perimeter of a rhombus = 4a

If the length of two diagonals of the rhombus is d_{1} and d_{2} then the area of a rhombus = ½ × d_{1} × d_{2}

These practice questions will help you solidify the properties of rhombus

## Trapezium

A trapezium (called Trapezoid in the US) is a quadrilateral that has only one pair of parallel sides. The parallel sides are referred to as ‘bases’ and the other two sides are called ‘legs’ or lateral sides.

A trapezium is a quadrilateral in which the following one property:

- Only one pair of opposite sides are parallel to each other

### Trapezium formulas – area and perimeter of a trapezium

If the height of a trapezium is ‘*h’ *(as shown in the above diagram) then:

- Perimeter of the trapezium= Sum of lengths of all the sides = AB + BC + CD + DA
- Area of the trapezium = ½ × (Sum of lengths of parallel sides) × h = ½ × (AB + CD) × h

These practice questions will help you solidify the properties of trapezium

## Properties of Quadrilaterals – Summary

The below image also summarizes the properties of quadrilaterals

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## Important quadrilateral formulas

The below table summarizes the formulas on the area and perimeter of different types of quadrilaterals:

Quadrilateral formulas |
Rectangle |
Square |
Parallelogram |
Rhombus |
Trapezium |

Area |
l × b | a² | l × h | ½ × d1 × d2 | ½ × (Sum of parallel sides) × height |

Perimeter |
2 × (l + b) | 4a | 2 × (l + b) | 4a | Sum of all the sides |

**Further reading:**

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## Quadrilateral Practice Question

Let’s practice the application of properties of quadrilaterals on the following sample questions:

### GMAT Quadrilaterials Practice Question 1

Adam wants to build a fence around his rectangular garden of length 10 meters and width 15 meters. How many meters of fence he should buy to fence the entire garden?

- 20 meters
- 25 meters
- 30 meters
- 40 meters
- 50 meters

#### Solution

**Step 1: Given**

- Adam has a rectangular garden.
- It has a length of 10 meters and a width of 15 meters.
- He wants to build a fence around it.

**Step 2: To find**

- The length required to build the fence around the entire garden.

**Step 3: Approach and Working out**

The fence can only be built around the outside sides of the garden.

- So, the total length of the fence required= Sum of lengths of all the sides of the garden.
- Since the garden is rectangular, the sum of the length of all the sides is nothing but the perimeter of the garden.
- Perimeter = 2 × (10 + 15) = 50 metres

Hence, the required length of the fence is 50 meters.

Therefore, option E is the correct answer.

### GMAT Quadrilaterals Practice Question 2

Steve wants to paint one rectangular-shaped wall of his room. The cost to paint the wall is $1.5 per square meter. If the wall is 25 meters long and 18 meters wide, then what is the total cost to paint the wall?

- $ 300
- $ 350
- $ 450
- $ 600
- $ 675

#### Solution

**Step 1: Given**

- Steve wants to paint one wall of his room.
- The wall is 25 meters long and 18 meters wide.
- Cost to paint the wall is $1.5 per square meter.

**Step 2: To find**

- The total cost to paint the wall.

**Step 3: Approach and Working out**

- A wall is painted across its entire area.
- So, if we find the total area of the wall in square meters and multiply it by the cost to paint 1 square meter of the wall then we can the total cost.
- Area of the wall = length × Breadth = 25 metres × 18 metres = 450 square metre
- Total cost to paint the wall = 450 × $1.5 = $675

Hence, the correct answer is option E.

We hope by now you would have learned the different types of quadrilaterals, their properties, and formulas and how to apply these concepts to solve questions on quadrilaterals. The application of quadrilaterals is important to solve geometry questions on the GMAT. If you are planning to take the GMAT, we can help you with high-quality study material which you can access for free by registering here.

Here are a few more articles on Math:

- Improve accuracy in Math questions on Polygons
- Geometry Questions – Most Common Mistakes | GMAT Quant Prep

Watch this GMAT geometry-free webinar where we discuss how to solve 700-level Data sufficiency and Problem questions in GMAT Quadrilaterals:

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## FAQs

**What are the different types of quadrilaterals?**

There are 5 types of quadrilaterals – Rectangle, Square, Parallelogram, Trapezium or Trapezoid, and Rhombus.

**Where can I find a few practice questions on quadrilaterals?**

You can find a few practice questions on quadrilaterals in this article.

**What is the sum of the interior angles of a quadrilateral?**

The sum of interior angles of a quadrilateral is 360°.