Skill 3 of 9 · GeometryClose

Area, circumference, radius, and diameter of a circle

Find the area and circumference of a circle, and find the radius or diameter when given the area or circumference.

  • Circumference C = πd (or 2πr). Area A = πr².
  • The radius is half the diameter.

Question 1 of 4

Greg installed a circular drain that has a diameter of 4.8 inches.

To the nearest tenth of an inch, what is the circumference of the drain?

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