Concept Check Refer to the discussion of accuracy and significant digits in this section to work Exercises 1–8.
Circumference of a Circle The formula for the circumference of a circle is C = 2πr . Suppose you use the π key on your calculator to find the circumference of a circle with radius 54.98 cm, and get 345.44953. Since 2 has only one significant digit, should the answer be given as 3 × 102 , or 300 cm? If not, explain how the answer should be given.
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