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Shehazana, who is feet tall, is walking toward a -foot tall streetlight. Write an equation for the length of her shadow, , in terms of the distance, , she is from the pole. Visualize this situation using the .

Right triangle, vertical leg shown as a light pole, labeled 20 feet, hypotenuse is dashed, horizontal segment, between hypotenuse & horizontal leg, shown as a person running, divides horizontal leg into 2 unequal parts, left section labeled, d, right section labeled, x.

Do you see the similar right triangles in this diagram? Recall that similar triangles have proportional sides. Set up a proportion and solve for .

Use the eTool below to visualize this situation.
Click the link at right for the full version of the eTool: Calc 1-201 HW eTool