Prefix ab-

123456
Across
  1. 3. day and night are equal length on this day
  2. 5. a math problem in which both sides are the same
  3. 6. the angles are all the same size
Down
  1. 1. the sides are all the same length
  2. 2. the imaginary line around the Earth
  3. 3. the same measure
  4. 4. equal force or value
  5. 5. to make even