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Across
  1. 3. - The amount of space a 3D object occupies.
  2. 5. - A rectangular array of numbers used in algebra.
Down
  1. 1. - A number indicating how many times a base is multiplied by itself.
  2. 2. - A number greater than 1 divisible only by 1 and itself.
  3. 4. - The ratio of a circle's circumference to its diameter (~3.14159).
  4. 5. - The middle value in a sorted set of numbers.