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Shearer Action 2! (Semicircular Angle Problem)

Author:
Tim Brzezinski
Creation of this resource was inspired by this tweet from Catriona Shearer. You can move any of the 3 LARGE POINTS anywhere you'd like at any time. What is the measure of the (soon-to-appear) pink angle? How can we formally prove this is always the case?

Quick (Silent) Demo

New Resources

  • Open Middle: Graphing Linear Inequalities (4)
  • Arc Length and Sector Area
  • Double Angle Trig Identity: Proof via Equal Areas
  • Simple Bridge (GeoGebra 3D Workshop)
  • Slanted or Curved Lines?

Discover Resources

  • ASA tri
  • Rotatii_6
  • พีระมิด
  • Function diagrams
  • Decimal Multiplication - CUEBA0013

Discover Topics

  • Subtraction
  • Surface
  • Similar Triangles
  • Geometric Distribution
  • Incircle or Inscribed Circle

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