5
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Not so. A decagon need not have any parallel sides. Or, it can have
one, two, three, four or five pairs of parallel sides,
one pair and one triplet of parallel sides, one pair one triplet and one quartet, and many many other combinations.
A decagon has 10 sides
A decagon has 10 sides
There are 10 sides on a decagon
Its not a do-decagon its a dodecahedran!!
Decagon is 10 sides. Octagon is 8 sides.
A decagon has 10 sides. It also have 10 angles.
A decagon has 10 sides.
A decagon has 10 sides
A decagon has 10 sides, and a quadrilateral has 4 sides, therefore a decagon has 6 more sides than a quadrilateral.
A nonagon has 9 sides and a decagon has 10 sides
A regular decagon has 10 equal sides.
A decagon has five more sides.