Unknown Length and Area Problems

What is an annulus? Pupils first learn about how to create an annulus, then consider how to find the area of such shapes. They then complete a problem set on arc length and areas of sectors.

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CCSS: Designed
Instructional Ideas

  • Bring in an object in the shape of an annulus and have the class determine its area
  • Have learners complete problem set as homework
Classroom Considerations

  • Learners need to be familiar with arc lengths and areas of sectors of circles (previous lesson)
  • The tenth installment of a 23-part module

  • Problem set includes a progression of difficulty
  • Teachers will appreciate the indication of mathematical practices
  • Resource includes answer key to all guiding questions, as well as worksheets

  • None
Common Core