How many of the following shapes must have 4 equal side lengths:
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The square and rhombus have 4 equal side lengths.
The parallelogram and rectangle have 4 sides, but they do not need to be equal.
The isosceles triangle only has 3 sides.
The pentagon has 5 sides, though all of them could be different. Hence, it does not have 4 equal side lengths.
Thus, only 2 of the figures have 4 equal side lengths.