More Problems on Area and Circumference

Perimeter check! Pairs work on finding the areas of semicircles and quarter circles using a relationship with squares. The problems challenge pupils to find areas of composite figures made from rectangles, semicircles, and quarter circles. 

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CCSS: Designed
Instructional Ideas

  • Lead a discussion about which other areas of sectors of circles would be easy to calculate
  • Have groups create figures made from semicircles, quarter circles, circles, and rectangles and find the area of the figure
Classroom Considerations

  • The class should know the formulas for area and circumference of circles
  • The 19th in a series of 28 lessons
Pros

  • Highlights the main concepts within the closing
  • Solutions show the steps required to arrive at the final answer
Cons

  • None
Common Core