what geometrical shape forms the hole that fits an allen wrench?
Answers
Hexagon. A 6 sided square 
what geometrical shape forms the hole that fits an allen wrench?
Look picture allen wrench, it has 6 sides square, it has hexagon shape.


Another question
What shape fits a allen wrench?
Answers from answers.yahoo.com :
Allen wrenches have 6 sides (hexagon) and come in various sizes in both American and Metric sizes

What geometric shape forms the hole that fits an Allen wrench?
Answer :
Hexagon

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