Geometric shapes

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Across
  1. 4. in which shape all the angles are right angles by definition
  2. 5. which shape has 3 corners
  3. 6. which shape has its opposite sides conqruent
  4. 7. Any point on the ...... is the same distance from center
  5. 8. which shape has three sides
Down
  1. 1. in which shape diagonals bisect each other
  2. 2. which shape has 4 equal sides
  3. 3. which shape has no sides and corners