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Area of circle is \"\".

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\"\"                          (Substitute diameter (d) = x + 3)

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\"\"                           (\"\")

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\"\"                           (Evaluate power: \"\") \"\"

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\"\"          (Using the formula \"\")

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\"\"            (Evaluate power: \"\")

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

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\"\"                  (Commutative property: a + b = b + a) \"\"

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The solution of Area of the circle \"\".