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A 3 sided shape is a triangle. A 4 sided shape could be a square or rectangle.
Loose-leaf paper (three to five holes punched on the side so that it can fit in both 2-ring and 3-ring notebooks) usually measures 8.5 inches wide by 11 inches long.
A 3-sided shape is called a triangle.or Polygon in general.
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It's a 6 sided shape.