Lesson 1 - Circle Terms
The objective of this first lesson is to learn the names of the different parts of the circle and to determine how some of those parts relate to others. We shall firstly recap on the terms used to describe parts of familiar shapes and as a class go through the slide shows on circle terms. Next we can work in pairs to complete the lesson GeoGebra activity. The quizzes and assessments should be completed individually.
Revision Time
Can you think of terms we use to describe the size of a rectangle? What do we call the sides?
Assess your own knowledge by watching the slide show. |
|
Circle Part Relationships
Use your mouse to change the radius of the circle by moving the green point with your mouse along the green slider. The radius is the green number.
Now try the following:
Now try the following:
- Move point A along the circle. Does the length of the radius ever change? What does moving A do?
- Move points B or D along the circle. Does the length of the diameter ever change? What does moving B or D do?
- Move point C. How does this affect the circle?
- Adjust the radius by sliding the green point along the green line. What happens to the diameter when the radius is adjusted? How are they related?
|
Practise Time!Let us put this new knowledge to the test! Please log into your www.sumdog.com account via the button below and complete the allocated tasks.
|
Homework and Early Finishers
If you haven't finished the allocated Sumdog activity and assessment during the lesson you will have to complete them both for homework. You are also required to download the circle term word search and complete it before the next lesson.
|
![]()
|
What did you think of the Lesson? |
Image Attributions: www.vi3x.deviantart.com and www.pixabay.com