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LearnZillion: Finding the Area of a Circle

Example Web Site and/or Technical Equipment Required


Website Example:

Tech Product Equipment

Computer(s), Internet access, projector, and speakers (for class presentation)

Activity Description

In this lesson, students will learn to find the area of a circle by exploring the relationship between a circle and a rectangle via a video from LearnZillion.

Shows LearnZillion lessons

LearnZillion has other short videos in math and language arts content areas addressing standards in grades second through high school. You will need to sign up for a free account to access their free resources.


  1. Start by establishing a free LearnZillion account .
  2. Then select and preview the video link above under Example Web Site. You may also want to scroll down the lesson page and preview the video, Guided practice for 'Find the area of a circle' .
  3. Match it to pages in whatever student textbook you are using for exercises to be done by the students.


  1. Introduce the lesson and the standard.
  2. Discuss the importance of the lesson on Geometry in everyday life.
  3. Play the video for students (Example Web Site link, above).
  4. Ask students if they have any questions and provide needed instruction and clarification.
  5. This lesson has a Guided practice video, show the video pausing after each problem is introduced; if you decide to use other videos at LearnZillion that do not have a Guided practice video, have the students work several problems in their textbook.
  6. Walk around the room assessing student learning and providing needed instruction and clarification.
  7. Assign several problems for homework.

Teacher Tips

  • Coach’s commentary videos (scroll down the page to see these) give quick previews of material covered in the lesson.
  • Assigning lessons outside the classroom gives students the freedom to learn at their own pace; however, that may not be realistic. Students may view the lessons during a scheduled visit to the computer lab or while you are working with another group in the classroom.
  • Students working independently can also view the video on an individual computer and then ask questions as necessary. The student will need headphones.

More Ways

  • LearnZillion provides free three to five minute videos in math and language arts content areas addressing standards in grades second through high school. Mine this site for more uses.
  • LearnZillion has a mobile app for students using iOS and Android devices, which allows for greater student accessibility through a smartphone, iPad, or other tablet device.

Select subjects and subcategories


  • Algebra
  • Geometry
  • Math Electives
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OTAN activities are funded by contract CN200091-A2 from the Adult Education Office, in the Career & College Transition Division, California Department of Education, with funds provided through Federal P.L., 105-220, Section 223. However, OTAN content does not necessarily reflect the position of that department or the U.S. Department of Education.