Geometry Puzzle

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Across
  1. 3. a set of all points in space given distance from the center
  2. 6. a new figure marked with a prime
  3. 8. have same shape and same size
  4. 9. circle that separates a sphere into two equal parts
Down
  1. 1. measure of the space occupied by a solid
  2. 2. to sides right tangle that make right angle
  3. 3. ratio of the lengths of two corresponding sides of two similar polygons
  4. 4. 3D figure with two parallel congruent circle bases
  5. 5. a figure with 3 sides
  6. 7. 3d figure with two parallel congruent circle