equ-, equi

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Across
  1. 4. having the same amount
  2. 5. to make equal
  3. 7. having all sides equal in length
  4. 8. having all angles equal in size
Down
  1. 1. a mathematical formula for
  2. 2. imaginary line around Earth
  3. 3. having the same measure
  4. 6. when the day and night are equal in length