Geometry

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Across
  1. 3. having equal sides
  2. 4. distance round the circle
  3. 7. Longest chord
  4. 8. half of diameter
Down
  1. 1. four sided shape
  2. 2. Angle grater than 180degree and less than 360 degree
  3. 5. six sided shape
  4. 6. portion of circumference