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The diameter of circle A is 9 times as great as the diameter of circle B. The area of circle A is how many times as great as the area of circle B? A) 9 B) 16 C) 81 D) 20 E) 1,543

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sqdancefan

Answer:

  C)  81

Step-by-step explanation:

Area of a circle is proportional to the square of the diameter. If the diameter is larger by a factor of 9, the area is larger by a factor of 9² = 81.

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