2D shapes

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Across
  1. 4. I have five edges.
  2. 5. I am equal to 90 degrees.
  3. 7. I have zero vertices.
Down
  1. 1. I have three sides.
  2. 2. I have four vertices. All my sides are the same length.
  3. 3. I have six edges.
  4. 6. I have four edges and four right angles.