The following links take you to free pentagon patterns for crocheting. These five-sided designs are fascinating crochet projects.
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This pentagon granny tutorial is by Sandra Petit, posted at Crochet Cabana. Sandra's pentagon is crocheted in Christmas colors, but you could make it in any color(s) you like.
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This lacy pentagon-shaped dishcloth was designed by Drew Emborsky, AKA the Crochet Dude. You'll find the free dishcloth pattern at his blog.