General mathematics

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Across
  1. 2. "A quantity representing a part of a whole"),
  2. 3. "The result of adding two or more numbers"),
  3. 6. "The smallest prime number"),
  4. 7. "A polygon with three sides"),
Down
  1. 1. "The perimeter of a circle")
  2. 2. "A number that divides another without a remainder"),
  3. 3. "A closed figure with four equal sides"),
  4. 4. "The middle value in a sorted data set"),
  5. 5. "An angle less than 90 degrees"),
  6. 8. "A straight path extending infinitely in both directions"),