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Explore the role that proportions play in the design of cakes composed of several tiers in this video from MPT. In the accompanying classroom activity, students watch the video. Next, they examine photographs of tiered cakes, taking measurements to determine if the tiers are in proportion. They conclude by reflecting on the cake photographs and considering why the cake designer maintains that cakes in proportion are pleasing to the eye. To get the most from the lesson, students should have some familiarity with ratio and related tables of values. For a longer self-paced student tutorial using this media, see "Proportional Relationships and Slope" on Thinkport from Maryland Public Television.