Math 7

Unit 4 Circles and Area

Lesson 4.5  Area of a Circle

Focus

The FOCUS section introduces the main concept that will be covered in the lesson.

Develop and use a formula to find the area of a circle.

There isn’t a Focus activity in this lesson.

Explore

Explore an idea or problem.
The exploration provides the background for the ideas presented in the lesson.

The textbook activity is fine, but..  it takes a LOT of work to get a limited result.
If your teacher wants you to do it,  make sure you do!

I will be exploring the same idea using an online applet that lets you do the same thing as the textbook, but much more easily.
(see the online activity section below)

TEXT Page 148

Do this if your teacher specifically wants you to....
Otherwise, do the activity in the next section.

Read/Work through the  Explore  section on Page 148 in your textbook.

Online Activity

Start by experimenting with THIS online applet.  (Geogebra)

Watch the following video for some ideas and comments to guide your exploration.

Video Tutorial  (Explore A)

Take some time to work with the applet and come up with some of your own ideas!!
Once you have done that, watch the next video for more of my comments.

Video Tutorial  (Explore B)

Connect

Connect summarizes the math in the lesson.
A presentation of ideas connected to the lesson focus.

TEXT Pages 149 - 150

Read/Work through the  Connect  section on Pages 149 - 150  in your textbook.

Even if you KNOW you are going to watch the video, READING this section is still important.

Getting the same information in multiple ways can help with understanding.

Watch

I covered all this information in the Explore B video.

Example

The Example will give you TOOLS for solving problems, and also show you that there may be different ways to approach a question.

Example

TEXT Page 150

Work through the Example  on Page 150 in your textbook.

Watch

Video Tutorial

Practice Problems

Doing Practice Problems

Practice problems reinforce the math presented in this lesson.

•	Work through the practice problems for this lesson.
	These problems are for practice, you don’t need to hand them in!
	(your teacher may assign specific questions for you to complete)

•	Use the answers in the back of the book to CHECK YOUR WORK!

•	If you make a mistake, TRY TO FIX IT!

•	If you need help or want more information, view the video solutions provided.

•	If you still need more help,  CONTACT YOUR TEACHER!

Types of Practice Problems

Assessment Focus a question that gives a good example of the kind of question you would be expected to answer after completing the lesson

Take It Further questions offer enrichment and extension.

Notes

Question 7,    do you see “yellow” in the picture...?
I sure don’t.    My picture has orange and blue.... so the final question would be,  what is the area of the “blue” part....

Video Solution Links

Check your work for every problem you do!
If you make a mistake,  try to fix it!
Use the video solutions for more information.
If a problem still doesn’t make sense, ASK YOUR TEACHER FOR HELP!

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