maths geometrical puzzle

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Across
  1. 2. A 3D shape that tapers smoothly from a circular base to an apex.
  2. 5. A quadrilateral with four right angles and opposite sides of equal length.
  3. 7. A quadrilateral with four equal sides and four right angles.
  4. 8. LINES Two straight lines in a plane that never intersect.
Down
  1. 1. A polygon with three edges and three vertices.
  2. 3. The name given to a triangle with three equal sides (followed by 'TRIANGLE').
  3. 4. A round plane figure whose boundary consists of points equidistant from the center.
  4. 6. A symmetrical three-dimensional shape, restricted by six equal squares.
  5. 7. A perfectly round three-dimensional object; the shape of a ball.
  6. 8. A structure whose outer surfaces are triangular and converge to a single point at the top.
  7. 9. A figure formed by two rays meeting at a common endpoint.