Geometry

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Across
  1. 2. Adjacent over hypotenuse
  2. 4. Distance around the circle
  3. 6. Quadrilateral with opposite sides parallel
  4. 7. Segment from center to circle
Down
  1. 1. Half of a sphere
  2. 3. Polygon with congruent sides and angles
  3. 5. Concave kite
  4. 6. Circumference divided by the diameter
  5. 8. Opposite over hypotenuse