2D shapes

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Across
  1. 4. the number of sides that are equal in a triangle
  2. 5. Opposite sides in this shape are equal
  3. 7. The outside of this shape is curved
Down
  1. 1. This shape has 4 equal sides
  2. 2. This shape has 3 corners
  3. 3. the number of corners in a square
  4. 6. the number of sides in a triangle