Two-Dimensional Shapes

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Across
  1. 2. Four straight edges of two different lengths with four vertices.
  2. 4. One curved line with no straight edges and no vertices.
  3. 5. Two edges with a common vertex.
  4. 7. The point where two edges meet.
Down
  1. 1. Four straight edges of equal lengths with four vertices.
  2. 3. Three straight edges with three vertices.
  3. 6. Same as a side.
  4. 7. The plural of vertex.