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Protractor Practice

Protractor Practice
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2017-03-15 23:48
AngleTrigonometryGeometric Construction
In collections Virtual Manipulatives Lines and Angles
This example demonstrates how a student creates an angle and then measures it. The core math concepts involved are angle measurement. Key GeoGebra commands used in construction include Circle, Line, Intersect, Rotate, Angle, Segment, and Point. It is suitable for middle school mathematics teaching, focusing on geometric construction and angle measurement practice.

GeoGebra Commands & Parameters

  1. Circle(B_1, a) → c
  2. Line(B_1, xAxis) → b
  3. Intersect(c, b, 2) → C_1
  4. Rotate(C_1, α, B_1) → C_2
  5. Angle(C_1, B_1, C_2) → β
  6. Segment(B_1, C_2) → d
  7. Rotate(C_2, γ, B_1) → A_1
  8. Angle(C_2, B_1, A_1) → δ
  9. Segment(B_1, A_1) → e
  10. Circle(D, f) → g
  11. Point(g) → E
  12. Rotate(E, (-ε), D) → E'
  13. Angle(E', D, E) → ζ
  14. Rotate(E, 184°, D) → E'_1
  15. Angle(E, D, E'_1) → η
  16. Circle(F, protrac2) → h
  17. Point(h) → G
  18. Rotate(G, (-adjust), F) → G'
  19. Angle(G', F, G) → θ
  20. Rotate(G, adjust + 180°, F) → G'_1
  21. Angle(G, F, G'_1) → ι
  22. Angle(C, B, A) → κ
  23. Segment(B, A) → i
  24. Segment(B, C) → j