The preceding diagram shows a figure composed of right triangle ABC adjacent to semicircle . If AB = OC = x, what is the perimeter of the figure?

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<img alt='images' src='https://www.fatskills.com/images3/gmat/f0398-02.jpg'><br>The preceding diagram shows a figure composed of right triangle <em>ABC</em> adjacent to semicircle <img alt='images' src='https://www.fatskills.com/images3/gmat/c0398-04.jpg'/>. If <em>AB</em> = <em>OC</em> = <em>x</em>, what is the perimeter of the figure?<br><br><img alt='images' src='https://www.fatskills.com/images3/gmat/e0398-05.jpg'>