What is the circumference of a circle of radius 10 cm? (Leave the answer in terms of pi.)

Answer and explanation

Correct answer: C. cm

  1. Step 1: Circumference = 2 x pi x r = 2 x pi x 10.
  2. Step 2: = 20 pi cm.
Answer
cm.
Why not the others: cm: this is the area formula . cm: the factor 2 was left out. cm: the factor 2 was applied twice.

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