Polygons
Overview
Polygons range from the humble triangle to shapes with dozens of sides. Understanding their angle properties, symmetry and naming conventions opens the door to multi-step geometry questions that combine several rules at once.
You will learn the properties of common quadrilaterals, calculate interior and exterior angles of regular polygons, and understand what it means for two shapes to be congruent. These facts are tested regularly on both papers.
Objectives
- Recognise and give the names of polygons
- Understand and use the term 'quadrilateral' and the angle sum property of quadrilaterals
- Understand and use the properties of the parallelogram, rectangle, square, rhombus, trapezium and kite
- Understand the term 'regular polygon' and calculate interior and exterior angles of regular polygons
- Understand and use the angle sum of polygons
- Understand congruence as meaning the same shape and size
- Understand that two or more polygons with the same shape and size are said to be congruent to each other
Mind map
This topic is mapped out so you can see how the ideas connect.
Open the mind map in the app
Flashcards
Quick recall practice on the facts this topic is tested on.
Practise these cards in the app
Lesson Note
Complete Note Available on the Green Bridge App
Get the Green Bridge CBT app on your phone or computer for the complete IGCSE library: past papers, mark schemes, mind maps, flashcards and audio lessons.
Lesson Evaluation
Congratulations on completing the lesson on Polygons. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- The sum of the interior angles of a hexagon is: A) 540 B) 720 C) 900 D) 1080 Answer: B
- Each exterior angle of a regular polygon is 60 degrees. How many sides? A) 4 B) 5 C) 6 D) 8 Answer: C
- Which quadrilateral has diagonals that bisect each other at right angles and are not necessarily equal? A) Rectangle B) Rhombus C) Trapezium D) Kite Answer: B
- A regular polygon has an interior angle of 140 degrees. How many sides? A) 7 B) 8 C) 9 D) 10 Answer: C
- Two shapes are congruent if they: A) Have the same angles only B) Have the same shape and size C) Have the same number of sides D) Have the same perimeter Answer: B
Work through these questions in the app
Work through these questions in the app
Recommended Books
Practice Mock Questions
Want to practice mock questions on Polygons? Download the Green Bridge CBT app to access mock questions and full practice assessments for this topic.
Download The App On Google Playstore
Everything you need to excel in your exams
