In this interactive, students explore how to use shadows, proportional reasoning, and similar figures to determine the unknown height of an object. The interactive allows students to explore the proportional relationships among the similar triangles formed by upright objects and their shadows at different times of day. The accompanying classroom activity provides guidance for using the interactive as a catalyst for discussing concepts and for incorporating it into whole, group, or individual instruction. Support Materials for Teachers are available.

Investigate the slopes involved in ski jumping. This video focuses on defining slope, showing how to calculate slope on a graph, with an expression, and positive and negative slopes.

Consider the relationships among health, portion size, and traditional soul food and fast food diets in this video from the Center for Asian American Media.