In the preceding right triangle ABC, is the altitude drawn to the hypotenuse . If AB = 18 and AC = 6, what is the length of ?

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<img alt='images' src='https://www.fatskills.com/images3/gmat/f0398-01.jpg'><br>In the preceding right triangle <em>ABC</em>, <img alt='images' src='https://www.fatskills.com/images3/gmat/c0398-01.jpg'/> is the altitude drawn to the hypotenuse <img alt='images' src='https://www.fatskills.com/images3/gmat/c0398-02.jpg'/>. If <em>AB</em> = 18 and <em>AC</em> = 6, what is the length of <img alt='images' src='https://www.fatskills.com/images3/gmat/c0398-03.jpg'/>?