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When the radius of a circle is multiplied by a factor of 3, by what factor will the area of the circle change? The area of a circle with radius 3 is x times big as the area of a circle with radius of 1
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When the radius of a circle is multiplied by a factor of 3, by what factor will the area of the circle change? The area of a circle with radius 3 is x times big as the area of a circle with radius of 1

User Truezplaya
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Factor of area = (factor of radius)²

Factor of area = (3)²

Factor of area = 9

Answer: The area of a circle with radius 3 is 9 times bigger than the area of a circle with radius 1.
User Hei
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