A decagon has 10 sides, and a hexagon has 6 sides. To figure out the total number of sides for 5 decagons and 5 hexagons:
Number of Sides = 5(10) + 5(6)
Number of Sides = 50 + 30
Number of Sides = 80
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74 sides
If the octagon is a regular octagon (all eight sides and all eight angles are equal), then it is a regular polygon. If it is not a regular octagon (i.e. if it is an irregular octagon) then is it an irregular polygon.
There are (5*6)+(4*5) = 50 sides
Each decagon has 10 sides, each nonagon has 9 sides and each pentagon has 5 sides. 4 decagons make 40 sides, 2 nonagons make 18 sides and 2 pentagons make 10 sides. When you add them all up together, you get 68 sides in total.
Polygon literally means 'many sides.' Squares, hexagons, dodecahedrons etc are all polygons.