$\"\"$

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The area of the entire square mat is $\"\"$

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$\"\"$ (Substitute 12 for l) \ \

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

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The area of the entire square mat is $\"\"$ . $\"\"$

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The diameter of the circle is 9 m \ \

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$\"\"$

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$\"\"$

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The area of a circle formula is $\"\"$

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$\"\"$ (Substitute 4.5 for r and 3.14 for $\"\"$ )

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

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

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$\"\"$ (Rounded to nearest square meter)

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The area of the circle used for competition is $\"\"$ . $\"\"$

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The area of the part that is not used for competition is area of mat minus area of mat.

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

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The area of the part that is not used for competition is 80 $\"\"$ .

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