The Circle

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Across
  1. 1. from one side of a circle to the other
  2. 5. all the way around the outside of the circle
Down
  1. 2. from one side of a circle to the other through the centre
  2. 3. the line that touches the outside of the circle once
  3. 4. the circle in welsh
  4. 6. from the centre of the circle to the circumference