Lesson+8+-+Sectors,+Segments,+and+Annuli+of+Circles

= Lesson #8 =

Title of lesson: Sectors, Segments, and Annuli of Circles
Description of lesson: Students will use what they've learned so far about finding the areas of circles to find the areas of sectors, segments, and annuli. Circles can be "cut" into these other pieces, so the students will use what they've learned so far not only to find the whole area of a circle, but to understand how sectors, segments, and annuli are related and to find the areas of these smaller pieces.

Assignment: We'll begin the lesson with a warm-up problem where students will work individually to find the area of a circle using what they learned in the previous lesson. After the students have been given 5 minutes to work individually, we will take 5 minutes to discuss the solution as a class.

A PowerPoint presentation will be displayed to the class. This presentation will introduce students to what sectors, segments, and annuli look like, and where they can be found in real world settings. The PowerPoint will also show students how to find the area of these pieces, and will include practice problems that we will complete as a class.

For homework, the students will be assigned a short worksheet of practice problems and asked to blog about the lesson: what they understood, what they didn't understand, what they thought could have been done differently, etc.

Resources/materials needed: Students may use the textbook as an additional reference. We will be using the following PowerPoint presentation during class and students will need to bring their notebooks, and a pencil. The worksheet will be posted on the class website along with the PowerPoint presentation for the lesson:



Technology reflection: The PowerPoint presentation posted in the lesson will reinforce learning. It will provide the formulas used in class so that students can use them for their homework. It will also provide an explanation of how the formulas relate to each other, and provide parents with a source for information if they'd like to check or help with the students' homework.

Evaluation: I will need to focus on making sure all of the students' needs are met by the lesson and that no one is being left behind. I will need to make sure I keep on track in terms of timing so that we are able to cover the unit in the time allotted. I will also need to make sure I have a backup plan in place just in case there is a technical problem with any of the technology. For example, I'll need to make sure I have printed copies of some of the PowerPoint slides in case the computer or projector aren't working. I'll also need to make sure I have a few copies of the homework printed in case there are any problems with the class website or there are students who can't access the internet for some reason.