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The length of the diameter will be 30 cm if the radius is 15 cm.

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Q: What is the length of the diameter if its radius is 15 cm?
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What is the radius of a circle with a diameter of 15 cm?

The diameter of a circle is twice its radius. Thus the radius of a circle is half its diameter. → a circle with a diameter of 15 cm has a radius of 15/2 cm = 7.5 cm


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