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  • Lavon Heath

    December 11, 2021 at 12:42 am

    I am struck by how much of the content I teach deals with proportional thinking: similar figures, dilations, slope, linear relationships and line of best fit.

    Anyway, our textbook always has “shadow” problems: “A 12 foot giraffe casts an 8 foot shadow. If Tom’s shadow is 4 feet long, how tall is he?” The constant of proportionality is 3/2. We can scale up to find the height of bigger building or scale down and convert to inches for an extension.