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23 January, 12:03

One revolution of a 40 cm diameter ball compared to a 20 centimeter diameter ball is:

A. 2 times as great.

B. 4 times as great.

C. The same

D. 1/2 times as great.

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Answers (2)
  1. 23 January, 12:09
    0
    D. 1/2 times as great.
  2. 23 January, 12:09
    0
    We need to compare their circumferences.

    Since circumference = π * diameter,

    40π : 20π = 2 : 1

    Hence, the answer is (A).
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