How many of the following 7 polygons have exactly 4 sides:
rectangle, scalene triangle, rhombus, square,
regular pentagon, parallelogram, equilateral triangle?
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The rectangle, rhombus, square and parallelogram have 4 sides.
The scalene triangle and equilateral triangle have 3 sides.
The regular pentagon has 5 sides.
Hence, 4 of the listed polygons have 4 sides.