Syllabus covered in the MSVgo app

Download MSVgo app now!

Chapter 3 – Understanding Quadrilaterals

The following Topics and Sub-Topics are covered in this chapter and are available on MSVgo:


Take a look around you. Can you see different structures with different sides and angles? When you eat bread, do you notice that it has 4 sides which are equal? Or when a kite flies in the sky you notice it has 4 sides but at different angles? Have you observed the structure of the beehive? Other objects around you like table, blackboard, television, bed and many more have more than three sides and varying angles. They consist of polygons. While understanding quadrilaterals you must be able to differentiate between them since there are many kinds of quadrilaterals based on their properties, such as a parallelogram, kite and trapezium. There are some special parallelograms as well which show similar and dissimilar properties with each other like rectangle, square and rhombus.

The above mentioned structures are called polygons but what is its meaning? Poly means many. Polygons are closed structures made up of only line segments. 

Classification of Polygons

Compare the carpet at your home and a beehive. Can you tell the difference between these two? Even though they are both polygons, a carpet has 4 sides while the beehive has 6 sides. This is how you can easily study polygons by classifying them on the basis of their vertices or number of sides. Polygon with three sides is called a triangle, those with four sides are called quadrilaterals, while those with five sides are called pentagons. Polygons having 6 sides like a beehive, are called hexagons, those with seven sides are heptagon and so on.

Quadrilaterals are the polygons which have 4 sides or vertices but different interior angles.

Look at your table and kite. Even though both of them have the same number of sides, the angles present inside them are different.

Quadrilaterals can be either concave or convex. What do you understand by these two terms? In convex quadrilateral, no portion of their diagonal is in the exterior while in concave they are in the exterior as well. Also, the sum of every interior angle in convex quadrilateral is less than 180°.

Sum of all the interior angles of a quadrilateral is 360° which is the angle sum property. Interior angle is formed as a result of intersection between two sides.

Later on, we shall discuss the term, diagonal. What does it mean? Diagonals connect two opposite vertices with each other.

Based on the nature of the sides and angles, quadrilaterals are further classified into different types.


Take a look at the tents. If you look from front you can see a structure of 4 sides out of which two are parallel. This is a trapezium. Quadrilaterals which have a pair of equal parallel sides are called trapezium. Non parallel sides are not equal to each other. A trapezium cannot be called a parallelogram.  


You can imagine the structure of a kite from the name itself. In a kite, two consecutive sides are equal to each other. It has 4 sides like A, B, C and D. AB=BC and CD=AD. Even though a kite is a quadrilateral but it is not a parallelogram.


Parallelogram is a quadrilateral having two pairs of parallel sides. This pair is made up of opposite sides. They are equal in length as well. Opposite sides and angles of parallelogram are equal. Both the diagonals intersect at the centre. A parallelogram is a trapezium but trapezium is not a parallelogram.

Some special parallelograms


In a rhombus, all the sides are equal and parallel to each other but the interior angles are not right angles. It shows all the properties of a parallelogram. It is like a kite but tilted one. Diagonals of a rhombus are perpendicular bisectors of one another.


It is a quadrilateral in which parallel sides are equal in length. Each interior angle inside the rectangle measures 90° i.e. right angle. A rectangle is a parallelogram but not a square. Diagonals of the rectangle are equal in length. These diagonals bisect each other.


In a square, all the sides are parallel to each other and equal in length. Each angle measures 90°. This means internal angles are right angles. It is a rectangle and rhombus as well. In a square, diagonals bisect each other at right angles and they are equal in length as well.

Q1. What do you mean by understanding Quadrilaterals?

A1. Understanding quadrilaterals means differentiating them on the basis of their properties, angles and sides.

Q2. How do you study Quadrilaterals?

A2. We can study quadrilaterals with the help of their interior angles, diagonals, angles, length and nature of sides.

Q3. What is a quadrilateral?

A3. In a trapezium if the sum of all the angles is equal to 360°, it is called a quadrilateral.

Q4. What is convex quadrilateral?

A4. Convex quadrilaterals are those with interior angles less than 180°.

Q5. What are 4 types of quadrilaterals?

A5. Four types of quadrilaterals are rhombus, square, rectangle, trapezium and kite.

By reading the above article, you must have understood the concept of quadrilateral, but to get a better insight download the MSVgo app.

MSVgo is an e-learning app which has been developed to embark conceptual learning in the students from grade 6-12. MSVgo has been providing the students with core understanding of the concepts. It is a video library which is an amazing collaboration of concepts with animations and explanatory visualisation. This app contains high quality videos based on the curriculum of CBSE, ICSE, ISC, IGCSE and IB curriculum in India. You must check out the videos on MSVgo to understand deeper concepts behind this topic.

High School Physics

  • Alternating Current
  • Atoms
  • Communication Systems
  • Current Electricity
  • Dual nature of Radiation and Matter
  • Electric Charges and Fields
  • Electricity
  • Electromagnetic Induction
  • Electromagnetic Waves
  • Electron Beams and Radioactivity
  • Electrons and Photons
  • Electrostatic Potential and Capacitance
  • Fluid Pressure
  • Force and Acceleration
  • Force And Laws Of Motion
  • Gravitation
  • Internal Energy
  • Kinetic Theory
  • Law of motion
  • Light – Reflection And Refraction
  • Magnetic Effects Of Electric Current
  • Magnetism and Matter
  • Management Of Natural Resources
  • Mechanical properties of Fluids
  • Mechanical properties of Solids
  • Motion
  • Motion in a plane
  • Motion in a straight line
  • Moving Charges and Magnetism
  • Nuclear Energy
  • Nuclei
  • Oscillations
  • Our Environment
  • Paths of Heat
  • Physical world
  • Ray optics and optical instruments
  • Semiconductor Devices
  • Semiconductor Electronics: Materials, Devices and Simple Circuits
  • Simple Machines
  • Sound
  • Sources Of Energy
  • Specific and Latent Heats
  • Spherical Mirrors
  • Static Electricity
  • Systems of Particles and Rotational motion
  • Thermal properties of matter
  • Thermodynamics
  • Units and Measurement
  • Vectors, Scalar Quantities and Elementary Calculus
  • Wave Optics
  • Waves
  • Work, Power and Energy

High School Chemistry

  • Acids, Bases and Salts
  • Alcohols, Phenols and Ethers
  • Aldehydes, Ketones and Carboxylic Acids
  • Aliphatic and Aromatic Hydrocarbons
  • Alkyl and Aryl Halides
  • Amines
  • Analytical Chemistry 
  • Atomic Structure
  • Atoms And Molecules
  • Basic concepts of Chemistry
  • Biomolecules
  • Carbon And Its Compounds
  • Carboxylic acids and Acid Derivatives
  • Chemical Bonding and Molecular Structures
  • Chemical Energetics
  • Chemical Equilibria
  • Chemical Kinetics
  • Chemical Reactions And Equations
  • Chemical Reactions and Their Mechanisms
  • Chemistry in Everyday Life
  • Chemistry of p-Block elements
  • Chemistry of Transition and Inner Transition
  • Classification of Elements
  • Coordination Compounds
  • Cyanide, Isocyanide, Nitro compounds and Amines
  • Electrochemistry
  • Electrolysis
  • Elements, Compounds and Mixtures
  • Environmental Chemistry
  • Equilibrium
  • Ethers and Carbonyl compounds
  • Haloalkanes and Haloarenes
  • Hydrocarbons
  • Hydrogen
  • Ideal solutions
  • Introduction to Organic Chemistry
  • Ionic equilibria
  • Matter
  • Matter Around Us
  • Matter In Our Surroundings
  • Metallurgy
  • Metals And Non-Metals
  • Mole Concept and Stoichiometry
  • Natural Resources
  • Organic Chemistry – Basic Principles
  • Periodic Classification of Elements
  • Physical and Chemical Changes
  • Physical and Chemical Properties of Water
  • Polymers
  • Preparation, Properties and Uses of Compounds
  • Principles and Processes of Isolation of Elements
  • Redox Reactions
  • Relative Molecular Mass and Mole
  • States of Matter
  • Structure Of The Atom
  • Study of Compounds
  • Study of Gas Laws
  • Study of Representative Elements
  • Surface Chemistry
  • The d-block and f-block elements
  • The Gaseous State
  • The p-Block Elements
  • The Periodic Table
  • The s-Block Elements
  • The Solid State
  • Thermodynamics

High School Biology

  • Absorption and Movement of Water in Plants
  • Adolescent Issues
  • Anatomy of Flowering Plants
  • Animal Kingdom
  • Bacteria and Fungi-Friends and Foe
  • Biodiversity and Conservation
  • Biofertilizers
  • Biological Classification
  • Biomedical Engineering
  • Biomolecules
  • Biotechnology and its Applications
  • Biotic Community
  • Body Fluids and Circulation
  • Breathing and Exchange of Gases
  • Cell – Unit of Life
  • Cell Cycle and Cell Division
  • Cell Division and Structure of Chromosomes
  • Cell Reproduction
  • Cellular Respiration
  • Chemical Coordination and Integration
  • Circulation
  • Control And Coordination
  • Crop Improvement
  • Digestion and Absorption
  • Diversity In Living Organisms
  • Ecosystem
  • Environmental Issues
  • Excretory Products and their Elimination
  • Flowering Plants
  • Genes and Chromosomes
  • Health and Diseases
  • Health and Its Significance
  • Heredity And Evolution
  • Heredity and Variation
  • How Do Organisms Reproduce?
  • Human Diseases
  • Human Eye And Colourful World
  • Human Health and Disease
  • Human Population
  • Human Reproduction
  • Hygiene
  • Improvement In Food Resources
  • Integumentary System- Skin
  • Kingdom Fungi
  • Kingdom Monera
  • Kingdom Protista
  • Life Processes
  • Locomotion and Movement
  • Microbes in Human Welfare
  • Mineral Nutrition
  • Molecular Basis of Inheritance
  • Morphology of Flowering Plants
  • Neural Control And Coordination
  • Nutrition in Human Beings
  • Organism and Population
  • Photosynthesis
  • Photosynthesis in Higher Plants
  • Plant Growth and Development
  • Plant Kingdom
  • Pollination and Fertilization
  • Pollution; Sources and its effects
  • Principles of Inheritance and Variation
  • Reproduction and Development in Angiosperms
  • Reproduction in Organisms
  • Reproductive Health
  • Respiration in Human Beings
  • Respiration in Plants
  • Respiratory System
  • Sexual Reproduction in Flowering Plants
  • Strategies for Enhancement in Food Production
  • Structural Organisation in Animals
  • Structural Organisation of the Cell
  • The Endocrine System
  • The Fundamental Unit Of Life
  • The Living World
  • The Nervous System and Sense Organs
  • Tissues
  • Transpiration
  • Transport in Plants

High School Math

  • Algebra – Arithmatic Progressions
  • Algebra – Complex Numbers and Quadratic Equations
  • Algebra – Linear Inequalities
  • Algebra – Pair of Linear Equations in Two Variables
  • Algebra – Polynomials
  • Algebra – Principle of Mathematical Induction
  • Algebra – Quadratic Equations
  • Binomial Theorem
  • Calculus – Applications of Derivatives
  • Calculus – Applications of the Integrals
  • Calculus – Continuity and Differentiability
  • Calculus – Differential Equations
  • Calculus – Integrals
  • Geometry – Area
  • Geometry – Circles
  • Geometry – Conic Sections
  • Geometry – Constructions
  • Geometry – Introduction to Euclid’s Geometry
  • Geometry – Three-dimensional Geometry
  • Geometry – Lines and Angles
  • Geometry – Quadrilaterals
  • Geometry – Straight Lines
  • Geometry – Triangles
  • Linear Programming
  • Matrices and Determinants
  • Mensuration – Areas
  • Mensuration – Surface Areas and Volumes
  • Number Systems
  • Number Systems – Real Numbers
  • Permutations and Combinations
  • Probability
  • Sequence and Series
  • Sets and Functions
  • Statistics 
  • Trignometry – Height and Distance
  • Trignometry – Identities
  • Trignometry – Introduction

Middle School Science

  • Acids, Bases And Salts
  • Air and Its Constituents
  • Basic Biology
  • Body Movements
  • Carbon and Its Compounds
  • Cell – Structure And Functions
  • Changes Around Us
  • Chemical Effects Of Electric Current
  • Chemistry in Your Life
  • Coal And Petroleum
  • Combustion And Flame
  • Components Of Food
  • Conservation Of Plants And Animals
  • Crop Production And Management
  • Electric Current And Its Effects
  • Electricity And Circuits
  • Elements and Compounds
  • Fibre To Fabric
  • Food production and management
  • Force And Pressure
  • Forests: Our Lifeline
  • Friction
  • Fun With Magnets
  • Garbage In, Garbage Out
  • Getting To Know Plants
  • Health and Hygiene
  • Heat
  • Hydrogen
  • Life Processes: Nutrition in Animals and Plants
  • Light, Shadows And Reflections
  • Materials: Metals And Non-Metals
  • Matter and Its States
  • Metals and Non-metals
  • Micro Organisms: Friend And Foe
  • Motion And Measurement Of Distances
  • Motion And Time
  • Nutrition In Animals
  • Nutrition In Plants
  • Organization in Living Things
  • Our Environment
  • Physical And Chemical Changes
  • Pollution and conservation
  • Pollution Of Air And Water
  • Reaching The Age Of Adolescence
  • Reproduction In Animals
  • Reproduction In Plants
  • Respiration In Organisms
  • Rocks and Minerals
  • Separation Of Substances
  • Simple Machines
  • Soil
  • Some Natural Phenomena
  • Sorting Materials Into Groups
  • Sound
  • Stars And The Solar System
  • Structure of Atom
  • Synthetic Fibers And Plastics
  • The Living Organisms And Their Surroundings
  • Transfer of Heat
  • Transformation of Substances
  • Transportation In Animals And Plants
  • Universe
  • Waste-water Story
  • Water: A Precious Resource
  • Weather, Climate And Adaptations Of Animals To Climate
  • Winds, Storms And Cyclones

Middle School Math

  • Addition
  • Area and Its Boundary
  • Boxes and Sketches
  • Data Handling
  • Fun With Numbers
  • Heavy and Light
  • How Many
  • Long And Short
  • Mapping
  • Measurement
  • Money
  • Multiplication and Factors
  • Multiply and Divide
  • Numbers
  • Parts and Wholes
  • Pattern Recognition
  • Patterns
  • Play With Patterns
  • Rupees And Paise
  • Shapes And Angles
  • Shapes And Designs
  • Shapes and Space
  • Similarity
  • Smart Charts
  • Squares
  • Subtraction
  • Tables And Shares
  • Tenths and Hundredths
  • Time
Please switch to portrait mode
for the best experience.
Click to open Popup