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the area of a circle 200mm in diameter is approximately how many times greater than the area of a circle 40mm in diameter?
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the area of a circle 200mm in diameter is approximately how many times greater than the area of a circle 40mm in diameter?

User Vitaliy Kalinin
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The area of a circle is pi times radius squared. So the area is proportional to radius squared. 200/40 = 5, and 5 squared = 25.
User Liftoff
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