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4 line segments
4 angles
2 sides are the size

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4 angles
2 obtuse angles
2 acute angles
all sides are the same length

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four sides
four angles
2 acute angles
2 obtuse angles

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top side of the eraser is a parallelogram
4 sides
2 short sides are equal and parallel
2 long sides are equal and parallel

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A square is constructed of 4 line segments of the same length, so opposite side lengths are equal.  A square has four right angles and has two sets of parallel lines.

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Group 1 -

Group 2 -

Group 3 -

Group 4 -