Presents the ideas of similarity, ratio, and proportion in an informal style. Draws examples from everyday life, using familiar objects with on-screen graphics that produce clear, well-defined diagrams. Provides explanations with worked examples. Also includes student practice. Simplifies and demonstrates methods to obtain indirect measurements, including surveying methods to find the width of a river and a mirror to find the height of a tall object. Accessibility options on the DVD are: (1) expanded description, (2) English subtitles in a black box, (3) subtitled description. Part of the "Mathemania" series.