A decagon need not have any. It can have five pairs, or two sets of 5 each, or various combinations in between.
A decagon has 10 sides
12
A decagon is a polygon with 10 sides and 10 angles. Deca is from the Greek meaning of "ten".
How many parallel sides has a trapezium?
0 Parallel sides
A pentagon has no parallel sides.
8
yes 2 parallel sides
It Has 2 Pair of Parallel Sides
a pentagon has no parallel sides
A triangle has no parallel sides.
It has three parallel sides. ;)