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KB & AH Circle Reflection

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KB & AH Circle Reflection

  1. 1. BY ALEXIS AND KATHERINE 7W The Area of a Circle
  2. 2. Problem <ul><li>We knew that the area of a rectangle was l×w, but did you know you can find the area of a circle using a similar formula? </li></ul><ul><li>The area of a circle is πr 2 . </li></ul> Width Length 
  3. 3. Process <ul><li>We cut 24 triangles out of a circle. We lined them up, trying to make a rectangle-like shape. </li></ul><ul><li>We reflected on the process by answering questions and figuring out how rectangles and circles are alike. </li></ul>
  4. 4. Challenges <ul><li>Cutting out the pieces was a bit difficult because they had to be exact. </li></ul><ul><li>Some of the questions were hard to answer about the process. </li></ul><ul><li>It was challenging to find a link between the area of a rectangle, and the area of a circle. </li></ul>
  5. 5. Solution <ul><li>A = l×w </li></ul><ul><li>A = c ⁄ 2 × r </li></ul><ul><li>A = πd / 2 × r </li></ul><ul><li>A = π2r / 2 × r </li></ul><ul><li>A = πr × r </li></ul><ul><li>A = πr 2 </li></ul>These are the steps that must be taken to see the connection between the area of a rectangle (l×w) and the area of a circle (πr 2 ).s