Folding Sculptures: A Focus on Surface Area and Scale Drawings

Middle School Math

Proportional Relationships and Slope

The constant difference, or the ratio of the rise to the run, is called the slope. The slope of Amanda Shafer’s cake is:

slope equals rise over run, equals six over one

A three-tiered cake with the height of the top tier measuring 6 inches, the height of the middle tier measuring 6 inches and the height of the bottom tier measuring 6 inches. A one- inch distance is labeled on the surface of the middle and bottom layers to show that each layer is 2 inches larger in diameter than the one on top of it. Lines are drawn at these measurements to show two triangles formed by the tiers.



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