$\"\"$

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Observe the figure:

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Radius of the circle $\"\"$ .

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Area of the circle formula is $\"\"$ .

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

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$\"\"$ (Group of like terms)

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$\"\"$ (Multiply exponents)

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$\"\"$ (Simplify)

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The area of the circle is $\"\"$ .

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$\"\"$

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The area of the circle is $\"\"$ .