Prove Like This: Parallelogram Properties

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• Offline Activity (.zip)

• GeoGebra Files

  1. Drag the points around. Do any things appear to always be congruent? Under what conditions will triangles ABC and CDA be congruent? (.ggb)
     
  2. Given: ABCD is a trapezoid with AB||DC. Drag the points around. Do any things appear to always be congruent? Under what conditions will triangles ABC and CDA be congruent? (.ggb)
     
  3. Given: ABCD is a parallelogram. Drag the points around. Do any things appear to always be congruent? Under what conditions will triangles ABC and CDA be congruent? (.ggb)