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Circle theorems: medium

Problem

In a circle with center C and radius 4 meters (m), a central angle of x intercepts an arc of 5π m as shown in the image. What is the value of x ?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
How do I enter a student-produced response on the SAT?