Vocabulary And Properties Of Circles
Overview
A circle has its own vocabulary: radius, diameter, chord, tangent, arc, sector and segment. Knowing exactly what each word means, and the key property that a tangent meets the radius at a right angle, turns circle problems from confusing to routine.
In this lesson you will learn the parts of a circle and the most useful property for problem solving: a tangent is perpendicular to the radius at the point where they touch. That single right angle is the key to a whole family of exam questions.
Objectives
- Use the vocabulary and properties of circles, including that a tangent is perpendicular to the radius at the point of contact.
Audio Lesson
Listen to this lesson in the app
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 Vocabulary And Properties Of Circles. 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.
- A line that touches a circle at exactly one point is a: A. chord B. diameter C. tangent D. radius Answer: C
- A tangent meets the radius at the point of contact at: A. 45 degrees B. 60 degrees C. 90 degrees D. 180 degrees Answer: C
- The diameter of a circle is: A. half the radius B. equal to the radius C. twice the radius D. the circumference Answer: C
- A tangent from an external point P has OT = 5 and OP = 13. The tangent length PT is: A. 8 B. 12 C. 13 D. 18 Answer: B
- A straight line joining two points on a circle is a: A. tangent B. chord C. sector D. arc 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 Vocabulary And Properties Of Circles? 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
