The document discusses ratios and proportions, providing examples of how ratios are used in art, architecture, and scale models. It defines ratios and extended ratios, and provides examples of writing ratios and using extended ratios to solve problems involving the sides of triangles given the ratios of the sides and the perimeter. Students should complete homework problems 1, 4, 5, 9, and 10 on pages 284-285 related to ratios and proportions.