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Vertically Opposite Angles are Equal

Vertically Opposite Angles are Equal
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2014-08-19 11:51
AngleTransformationGeometric Construction
This interactive diagram demonstrates the theorem that vertically opposite angles are equal. By constructing two intersecting lines, it shows that the opposite angles have the same degree. The example uses GeoGebra commands such as Segment, Intersect, and Angle. Suitable for students at the middle school level and above to learn geometry.

GeoGebra Commands & Parameters

  1. Segment(A, B) → a
  2. Segment(C, D) → b
  3. Intersect(a, b) → E
  4. Angle(D, E, A) → α
  5. Angle(C, E, B) → β
  6. Angle(A, E, C) → γ
  7. Angle(B, E, D) → δ