math crossword

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Across
  1. 2. a shape were opposite sides are parallel to each other
  2. 3. the total distance around a shape
  3. 6. the length of a circle with a line in the middle
  4. 8. a round shape
  5. 9. a number to find a circles area and circumference
Down
  1. 1. the distance around the circle
  2. 4. half of the diameter
  3. 5. a three sided shape
  4. 7. the amount of space inside of a shape