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Monique and her dad built a hang glider together. After testing the new glider for safety, the glider was ready for the first big flight. Monique jumped off a tall sand dune and traveled in a diagonal line from the top of the dune toward the ground. She flew for feet and landed on level ground at a spot feet horizontally from where she took off. How tall was the sand dune?

What geometric shape is the dashed line making?

Since the information given shows different parts of a right triangle,
you can make use of the Pythagorean theorem to find the missing leg.