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A decagon has 10 sides, and a hexagon has 6. So in 4 decagons and 5 hexagons there are (4*10)+(5*6) = 70 sides
There are 8 triangles in a decagon
A decagon can have eight or more triangles - up to infinitely many.
There are 8 triangles inside a 10 sided decagon
10 triangles make a decagon
A decagon has ten sides and a triangle has three, so 5 decagons and 4 triangles have (5*10)+(4*3) = 62 sides altogether.
There are: (5*6)+(3*5)+(5*3) = 60 sides
A decagon has 10 sides
A decagon has 10 sides
120 triangles.
10 triangles
10-2 = 8 triangles