$\"\"$

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Given that $\"\"$

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$\"\"$ Where r = radius.

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CE is the radius of the circle E.

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so, $\"\"$

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Multiply each side by 2)

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$\"\"$ (Cacel common terms)

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ $\"\"$

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The diameter of the circle E is 10.4 inches.