The derivation of the volume formula of a cylinder is based on the mathematical idea of (). In this process, () has changed and () has not changed. The height of the assembled figure is equal to that of (), and their bottom area (), so the volume formula of a cylinder is ()

The derivation of the volume formula of a cylinder is based on the mathematical idea of (). In this process, () has changed and () has not changed. The height of the assembled figure is equal to that of (), and their bottom area (), so the volume formula of a cylinder is ()

The pushing process of cylinder volume formula is based on the mathematical idea of (transformation). In this process, (shape) changes, (volume) does not change. The (height) of the figures higher than the cylinder is equal, and their bottom area is equal, so the cylinder volume formula is (bottom area x high)