Perimeter

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Across
  1. 4. a shape with three sides
  2. 5. a shape with one pair of opposite sides parallel
  3. 7. a six sided shape.
Down
  1. 1. the total distance around a shape.
  2. 2. a four sided shape, with opposite sides equal length and parallel.
  3. 3. a thousand meters
  4. 6. the distance from the centre of the circle to the edge.