Unit 10 Lesson 5 Area of Circles and Sectors
Unit 10 Lesson 5: Area of Circles and Sectors
Lesson Overview
Area of a Circle
What You Will Learn
- finding the area of circles, sectors, and segments of circles
Overview
In this lesson, you will learn to find the areas of parts of a circle. You will show your learning by finding the area of circles, sectors, and segments of circles.
Essential Understanding
You can find the area of a circle when you know its radius. You can use the area of a circle to find the area of part of a circle formed by two radii and the arc the radii form when they intersect with the circle.
- - Read pages 437-443 in your course textbook
This course is based on a textbook that is viewable by clicking on the textbook icon. Keep the textbook open while you go through the lesson so that you may refer to it throughout the lesson.
Lesson 5: Area of Circles and Sectors
Resource Videos
Area of a Sector of a Circle
Area of a Segment of a Circle
Proceed to Next Page
Prepare for Application
Instructions
You have now studied Areas of Circles and Sectors. It is now time to demonstrate your learning.
Try the activities below on your own. You should be able to answer these before beginning the practice.
Create a journal extra called 'Unit 10: Lesson 5 activities' and do these activities in your journal.
Activity 1
- What is the area of a circular region with a 42-ft diameter?
- If the radius of a circle is halved, how does its area change? Explain.
Activity 2
If a circle has a radius of 4 in. What is the area of a sector bounded by a 45° minor arc? Leave your answer in terms of π.
Activity 3
