Shapes and Angles

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Across
  1. 4. it has one curved surface and one base
  2. 6. it has 1 curved surface and no flat face
  3. 8. it has two pair of equal opposite sides
  4. 9. it has 4 sides
  5. 11. this shape is round
  6. 12. there are 3 lateral faces and 2 bases
Down
  1. 1. the shape of the base of a triangular pyramid
  2. 2. this shape has 4 equal sides and 4 right angles
  3. 3. it's an angle smaller than right angle
  4. 5. it's an angle bigger than right angle
  5. 7. it has 6 faces, and its lateral faces are triangle
  6. 10. it has 6 sides