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a decagon has 10 sides and a pentagon has 5 so if you subtract 5 from ten that is your answer Answer=5
A decagon has 10 sides. Any regular polygon with four or more sides will have pairs of sides that are parallel. A decagon will have 5 pairs of parallel sides.
A decagon can have 0, 2, 3, 4, 5, 6, 7, 8, 9 or 10parallel sides, depending on its layout.A decagon has 10 sides. Any regular polygon with four or more sides and even vertices will have pairs of sides that are parallel. A regular decagon will have 5 pairs of parallel sides.It is possible for a decagon to have 2 groups of 5 parallel sides. (For example, a block letter F).
find the perimeter of a decagon if all off the sides equal 4mi.
Make a triangle, each of whose sides is 2 matchsticks long. This uses six matchsticks. Join the middle points of the sides of this triangle to one another - using another three match sticks. You will then have four small triangles and one large one.