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The diameter of a circle is twice the length of the radius. Therefore, if the radius is 4.2 cm, the diameter would be 2 x 4.2 cm = 8.4 cm.

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More answers

Diameter is twice the radius, therefore 4.2cm radius = 8.4cm diameter.

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Wiki User

13y ago
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8.4 is the right answer khan

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8.4

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Anonymous

5y ago
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17

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Anonymous

5y ago
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Q: What is the diameter of a circle with a 4.2 cm radius?
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