Maths-
SAT
Easy

Question

The circumference of Earth is estimated to be 40,030 kilometers at the equator.  Which of the following best approximates the diameter, in miles, of Earth’s  equator?  (1 kilometer ≈ 0.62137 miles)

  1. 3,205 miles
  2. 5,541 miles
  3. 7,917 miles
  4. 13,004 miles

The correct answer is: 7,917 miles



    Earth's circumference at the equation
    2 πr equals space 40030
straight r equals fraction numerator 40030 cross times 7 over denominator 22 cross times 2 end fraction
straight r asymptotically equal to 6368.4 space kilometers
    Diameter D = 2r
    asymptotically equal to 2 cross times 6368.4 space k i l o m e t e r s
asymptotically equal to 12736.8 space k m s
1 space k m space asymptotically equal to 0.62137 space m i l e
rightwards double arrow 12736.8 cross times 0.62137
asymptotically equal to 7914
    Option C is correct approximately.

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