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Draw Angles with Protractor

Draw Angles with Protractor
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2012-04-25 00:04
AngleTrigonometryGeometric Construction
This example demonstrates how students can align segments using a protractor to form desired angles. The core math concepts involved are angle measurement and construction. Key GeoGebra commands used include Point, Segment, Circle, Line, Intersect, Rotate, and Angle. It is suitable for middle school mathematics education, helping students master the basic skills of angle drawing.

GeoGebra Commands & Parameters

  1. Point(Circle[A, ProtractorSize]) → B
  2. Segment(A, B) → a
  3. Circle(A, Segment[A, B]) → c
  4. Line(B, A) → b
  5. Intersect(c, b, 2) → C
  6. Rotate(α1, 78*°, α2) → α5
  7. Segment(α2, α5) → α3
  8. Angle(ζ3, ζ2, ζ1) → ζ
  9. Segment(ζ1, ζ2) → ζ4
  10. Segment(ζ2, ζ3) → ζ5