 ## CCSS.MATH.CONTENT.6.RP.A.1

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### Why do rivers meander instead of traveling in a straight line? In going from point A to point B, why should a river take the circuitous route it does instead of a direct path? Furthermore, what information can the ratio of the river’s length to its straight-line distance tell us? In this segment the geological forces that account for a river’s motion are explained. In the process, the so-called Meander Ratio is explored. Students construct a mathematical model of a meandering river using the TI-Nspire. Having built the model, students then use it to generate data to find the average of many Meander Ratios. The results show that on average the Meander Ratio is equal to pi. This video includes a Video Transcript: https://www.media4math.com/library/video-transcript-algebra-applications-variables-and-equations-segment-3-river-ratios A Promethean Flipchart is available for this video: https://www.media4math.com/library/promethean-flipchart-algebra-applications-river-ratios ### In this Brief Review, the addition and subtraction of rational numbers is explored. Note: The download is an MP4 file. ### In this Brief Review, applications of rational numbers are explored. Note: The download is an MP4 file. ### In this Brief Review, division of rational numbers is explored. Note: The download is an MP4 file. ### In this Brief Review, multiplying rational numbers is explored. Note: The download is an MP4 file. ### In this Brief Review, rational numbers are defined. Note: The download is an MP4 file. ### The definition of the term "Ratio." ### The definition of the term "Scale Drawing." ### In this Slide Show, do a hands-on geometry activity to measure π. Note: The download is a PPT file. ### Ratios and Rates: Example 1. Calculating a 1:1 ratio. ### Ratios and Rates: Example 2. Calculating a 1:2 ratio. ### Ratios and Rates: Example 3. Calculating a 1:3 ratio. ### Ratios and Rates: Example 4. Calculating a 1:4 ratio. ### Ratios and Rates: Example 5. Calculating a 1:5 ratio. ### Ratios and Rates: Example 6. Calculating a 2:1 ratio. ### Ratios and Rates: Example 7. Calculating a 2:3 ratio. ### Ratios and Rates: Example 8. Calculating a 2:5 ratio. ### Ratios and Rates: Example 9. Calculating a 1:2:1 ratio. ### Ratios and Rates: Example 10. Calculating a 1:3:1 ratio. ### Ratios and Rates: Example 11. Calculating a 1:4:1 ratio. ### Ratios and Rates: Example 12. Equivalent ratios for 3:4:5 right triangles. ### Ratios and Rates: Example 13. Equivalent ratios for 5:12:13 right triangles. ### Ratios and Rates: Example 14. Equivalent ratios for 30-60-90 right triangles. ### Ratios and Rates: Example 15. Equivalent ratios for 45-45-90 right triangles. ### Ratios and Rates: Example 16. Calculating rate for distance vs time. 