Describing shapes

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Across
  1. 4. It has four straight sides that are all the same length.
  2. 6. It has four straight sides, with each side the same length as the opposite side.
  3. 7. Is a measurement of the space in a corner where two lines meet each other.
  4. 8. It is a long, thin mark along a surface.
  5. 9. It extends in one direction and does not turn or bend.
Down
  1. 1. It is bent or rounded.
  2. 2. It has a shape that is round, in which each point along the edge is an equal distance from the center.
  3. 3. It extends from a corner to an opposite corner, usually through the middle of a square or rectangular shape.
  4. 4. The physical form or outer line of something.
  5. 5. It has three straight sides that may be the same length or different lengths.