Geometry
posted by cindy .
Which of the following is true if a pentagon tessellates a plane?
a. A pentagon never tessellates a plane
b. All of its sides must be the same length
c. It must be a regular pentagon
d. It has one pair of parallel slides

Note that the tessellation required did not mention a regular pentagon.
Examine the two examples shown in the following link, and make conclusions accordingly.
http://img504.imageshack.us/img504/9859/tessellationwithapentag.png
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