Episode 1. Similarity: Scaling multiplies lengths by the same factor and produces a similar figure. It preserves angles and ratios of lengths of corresponding line segments. Animation shows what happens to perimeters, areas, and volumes under scaling, with various applications from real life. A Program Guide and Workbook is available for each episode, except episodes 6 and 9, and is available in PDF and TIFF formats for download: https://caltech.box.com/s/magxt15ygyrz40u32dse5sqry011gpt5 ©1990 California Institute of Technology