Volume of a pyramid
Drag the points A, B, C, D and/or E and look how this affects the volume of the pyramid. You can modify the height of the pyramid by moving the slider.
Alike as the area of a triangle doesn't depend on the form but only of the length of base and height, the volume of a pyramid only depends on the area of the base and the heigth of the pyramid. Moving point E horizontally doesn't affect the volume of the pyramid. Based on this property there are some graphical solutions to find a formula for the volume of a pyramid.