Multiple choice

The diameter of the sphere is $20$, then the radius of its greatest circle is.

  1. $40$
  2. $20$
  3. $10$
  4. $5$
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C Correct answer
Explanation

The greatest circle of a sphere is its cross-section through the center, which has the same radius as the sphere. Diameter = 20, so radius = 10.

AI explanation

The diameter of a sphere is twice its radius. A great circle shares its radius with the sphere. To find the radius, divide the given diameter by 2, which gives 20 / 2 = 10.

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