Work backwards if you dare. Scholars view a video to learn how to apply the area formula of a circle to solve problems. They watch an example where the focus is finding the radius of a circle given its area, requiring the use of inverse operations to solve for r.

Concepts

area formulas, area of circles, radius

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Additional Tags

math

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Instructional Ideas

• Provide the video to classmates struggling with the concept
  

Classroom Considerations

• Learners should have experience using the area formula of a circle
• Note that the video uses a TI-84 calculator; pupils must be able to find pi on their own calculators
  

• This video is hosted on YouTube

Pros

• Step-by-step explanations make calculations clear
  
• Work shown is organized and neat
  

Cons

• None

Common Core

7.G.B.4