They do not necessarily have pentagons. See for example, the brazuca, the official football design for the 2014 World Cup.
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Yes providing that they are regular 5 sided pentagons otherwise no if they are irregular pentagons
no - parallelograms have four sides; pentagons have five.
They have a few pentagons on it.
All pentagons are 5 sided polygons
All pentagons have five sides. When you see a five sided figure you will always know it's a pentagon.