Which mathematical tool had a major product recall in 2004 due to a design flaw that caused inaccurate angle measurements, affecting millions of students worldwide?

Before digital calculators and computers, mathematicians relied on various physical tools and devices for calculations and education. Many of these products shaped how mathematics was taught and practiced for generations. This poll tests your knowledge about an iconic mathematical product that faced a significant design controversy and subsequent recall that affected classrooms worldwide.

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• The Oxford Geometric Compass Set
• The Staedtler Mars Professional Protractor
• The Texas Instruments TI-83 Calculator
• The Faber-Castell Slide Rule

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