The following figure shows a piece of paper that is 15 inches long. Peter folds it in half (along the dotted line) and then makes one cut so that when he unfolds the paper, a perfect circle has been cut out. If the circle's diameter equals one-third of the length of the paper, what was the length of the cut that Peter made?

The GED Mathematical Reasoning test measures your algebraic and quantitative problem-solving skills and requires you to demonstrate an understanding of mathematical concepts, the skill to use those concepts, and the ability to apply knowledge in real-world scenarios.