For anyone who is not a synesthete, a decagon has no specific colour. Individual synesthetes will see decagons in different colours.
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a plane closed figure with ten sides and ten angles. degree: a unit of measurement of an angle. diagonal of a polygon: a line segment connecting one vertex to another vertex, and not a side of the polygon.
Decagons have 10 lines of symmetry i dont know where
Yes 2 ten sided regular decagons can be similar or congruent to each other
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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
A decagon has ten sides and a triangle has three, so 5 decagons and 4 triangles have (5*10)+(4*3) = 62 sides altogether.