The hexagon has six sides. So the perimeter will be 6a.
a=5cm
6a=6x5
=30 cm
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Each side = 20/4 = 5 cm Area = 5*5 = 25 square cm
It's got 5 sides, so multiply 6 cm by 5...
5 x 4.9 = 24.5 cm
* no, that would mean would of your side lengh's is larger than your whole shape
Pentagon means five sides. If one side is 4cm, then the perimeter which is the total length of all the sides is 4cm multiplied by 5 equals to 20 cm.