Math Shapes

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Across
  1. 5. a shape with 4 sides
  2. 6. a shape with 10000 sides
  3. 7. a shape with 1 billion sides
  4. 8. a shape with 16 sides
Down
  1. 1. a shape with three sides
  2. 2. a shape with 4 equal sides
  3. 3. a shape with 1000 sides
  4. 4. a shape with 100 sides