mathematics

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Across
  1. 2. result of multiplying the number by itself
  2. 4. to add or plus
  3. 5. a vertex joining
  4. 6. triangle with all three sides of equal length
  5. 9. lines that are always same distance apart
  6. 10. a straight line that forms an angle of 90
Down
  1. 1. not rational
  2. 3. area of base * eight
  3. 7. a part of mathematics
  4. 8. trying with all the three sides unequal