Math terms

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Across
  1. 2. a letter in the Greek alphabet that is used as a variable to represent an angle in math
  2. 4. the Pythagoras theorem is related to ______________
  3. 5. 3.14159…
  4. 6. a mathematical formula that expresses the equality of two expressions, by connecting them with the equals sign =.
Down
  1. 1. repeated addition
  2. 3. combine something together