Geometry

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Across
  1. 2. greater than a semicircle
  2. 6. smaller than a semicircle
Down
  1. 1. half of a circle and 180 degrees
  2. 3. a segment that has one endpoint at the center (Half of a diameter)
  3. 4. a line segment connecting two points on a curve
  4. 5. part of a circle