Three pentagons have a total of 15 sides. Each pentagon has 5 sides, so when you have 3 pentagons, you would multiply 5 sides by 3 pentagons to get 15 sides in total.
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37 sides
10c5
Pentagons have 5 sides if that's any help..
If the they are plain figures ( 2 - dimensional), then they are pentagons. Remember you Latin ; 'Penta' means five(5). Pentagons can be regular ( all sides the same length ) , or irregular ( the sides are of different lengths).
Dodecahedron