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Provides viewers with an introduction to key concepts involved with triangles and quadrilaterals. Includes defining rational numbers as the ratio of two integers, defining rational numbers as a terminating or repeating decimal, proportional reasoning, and examples of converting between decimals and rational numbers. Accessibility options on the DVD are: (1) expanded description, (2) English subtitles in a black box, (3) subtitled description. Part of the "Mathemania" series.
