Maths shapes

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Across
  1. 2. A shape with no corners
  2. 4. A prism shaped as a triangle
  3. 6. Shape with 10,000
  4. 7. Half of a sphere
  5. 8. Something to put icecream in
  6. 9. 3D square
Down
  1. 1. One of the rarest and most valuable gems in the world
  2. 3. Weirdest shape in the world
  3. 4. 3D donut
  4. 5. Round 3D shape