Understanding elementary shapes

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Across
  1. 4. A polygon in which all sides and angles are equal.
  2. 6. Sides, vertex and diagonals are ___________ of polygons.
Down
  1. 1. The point where two sides of a polygon meets.
  2. 2. A polygon with minimum number of sides.
  3. 3. A closed figure made up of line segments.
  4. 5. There are ______ number of sides in a heptagon.