A circle has circumference 31.4 cm. Using , what is its area?

Answer and explanation

Correct answer: B. , from a radius of 5 cm

**Answer: . Why not the others:** 157 and 314 use the diameter or a doubled radius; 15.7 is not an area.
  1. Step 1: , so cm.
  2. Step 2: Area: .

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