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The angle between two rays is 60 degrees, and the two rays contain three.........what is the radius of the third circle?

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The angle between two rays is 60 degrees, and the two rays contain three circles in a row, as shown below. Each circle is tangent to both rays, and each larger circle is tangent to the next smallest circle. If the smallest circle has a radius equal to 1, what is the radius of the third circle?

enter image description here

posted Aug 31 by Deepak Chitragar

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