LET'S BEGIN !

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Across
  1. 4. The distance from the center to any point in the circumference
  2. 6. A line across a circle through its center
  3. 7. The small number that shows repeated multiplication
  4. 8. A number that shows parts of a whole
Down
  1. 1. The number in front of a variable
  2. 2. The distance all the way around a shape
  3. 3. Lines that never meet, no matter how far they extend
  4. 5. A mathematical sentence with an equal sign