5 (penta = 5, hexa = 6, hepta = 7, octo = 8...)
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There are infinitely many regular pentagons - a different one for each value for the length of its side.
20 :)
A pentagon has 5 sides. If you have 4 pentagons, you use: 4x5=20. Therefore, 4 seperate pentagons have 20 sides. This is not true if you have them combined however.
12
On the 32-panel soccer ball, there are 12 pentagons and 20 hexagons.