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<p>A circle of radius r touches two sides of a right angled triangle, sides x and y, and has its center on the hypotenuse. Can you prove the formula linking x, y and r?</p>
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<p>A circle of radius r touches two sides of a right angled triangle, sides x and y, and has its center on the hypotenuse. Can you prove the formula linking x, y and r?</p>
