Google Classroom
GeoGebraGeoGebra Classroom

equal cross sections

Two triangular pyramids of same base and height are cut by a horizontal plane. The apexes D and E can be dragged horizontally and independently. Drag G to change the height of the cutting plane. The cross sections should be the same. View from top to see more clearly the shape of the bases and sections. According to the Cavalieri's Principle*, the volume of these pyramids should be equal.