Isn't paper pushing supposed to be boring? Learners attempt a paper-pushing puzzle to develop ideas about angles inscribed on a diameter of a circle. Learners then formalize Thales' theorem and use geometric properties to develop a proof of the theorem.

Concepts

theorems, inscribed angle, right triangles, diameter

Show More Show Less

Additional Tags

math

Show More Show Less

Instructional Ideas

• Use the lesson to introduce Thales' theorem

Classroom Considerations

• Experiment requires materials (paper, colored stock paper, markers)
• Be sure to model the experiment, as instructions may be confusing to participants
• The first installment of a 23-part module

Pros

• Hands-on activity keeps learners engaged in the subject material
• Teacher version includes useful background information and an answer key to student worksheets
• Resource includes link to further information on Thales' theorem

Cons

• Inconsistent spelling of Thales' theorem vs Thales's theorem

Common Core

HSG-C.A.2 HSG-C.A.3