- Duncan's GeogebraExterior Angles of PolygonsInvestigate the sum of interior angles in polygonsAngles of Polygons DiscoveryGraph the LineConverting TimeRotational SymmetryAdding Fractions with DiagramsFrequency Polygons, Cumulative Frequency and Box Plots (2.02a)Improper Fractions and Mixed NumbersPavés et volumesCopy of Množenje razlomaka / Multiplying fractionsDividing a Whole Number by a FractionRegular polygon