Lesson Plan


An interesting problem that has students find the area of a particular section of a circle that resembles the pupil of a snake eye. The result is rather surprising, because the area does not involve pi.


  • Mathematics > General
  • Mathematics > Applied Mathematics
  • Mathematics > Calculus
  • Mathematics > Estimation
  • Mathematics > Measurement

Education Levels:

  • Grade 9
  • Grade 10
  • Grade 11
  • Grade 12


geometry measurement coordinate conjecture pythagorean theorum trapezoid



Access Privileges:

Public - Available to anyone

License Deed:

Creative Commons Attribution 3.0


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Curriki Rating
On a scale of 0 to 3
On a scale of 0 to 3

This resource was reviewed using the Curriki Review rubric and received an overall Curriki Review System rating of 2, as of 2009-07-26.

Component Ratings:

Technical Completeness: 1
Content Accuracy: 2
Appropriate Pedagogy: 3

Reviewer Comments:

This interesting problem has left out in its set-up a central crucial fact: The figure ACBD is a circle. Without this fact (and the drawing doesn’t make it look like a circle), the problem is unsolvable. With this fact included, it’s a surprising solution as the author says.

Not Rated Yet.

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