text: // Geometry Basics: Circle Circumference in 2D
  
  // This series of katas will introduce you to basics of doing geometry with computers.
  
  // Point objects have x, y attributes. Circle objects have center which is a Point, and radius, which is a number.
  
  // Write a function calculating circumference of a Circle.
  
  // Tests round answers to 6 decimal places.
  
  function circleCircumference(circle) {
      return 2 * Math.PI * circle.radius
    }