2-D and 3-D shape puzzle

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Across
  1. 3. 8 sided polygon, shaped like a stop sign
  2. 5. 3-D figure shaped like a ball
  3. 7. 3-D figure, 2 triangle bases, 3 rectangle faces
  4. 8. 3 sided polygon
Down
  1. 1. 3-D figure shaped like a soda can
  2. 2. 4 sided polygon, all sides are equal
  3. 4. 3-D figure with 6 square faces
  4. 6. 3-D figure 1 square base, 4 triangle faces, comes to a vertice