Geometry

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Across
  1. 2. Intersecting lines at a right angle
  2. 4. Part of the circles curve
  3. 6. Segment that cuts something into two congruent parts
Down
  1. 1. Half of a circle
  2. 3. Segment with end points on a circle through the center
  3. 5. A segment in a circle with endpoints on the circle