None. Since the number of sides is odd, there can be no parallel sides.
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It depends on the base. If the base is an n-sided regular polygon, the pyramid will have n/2 pairs of parallel sides. The number of parallel sides when the base is irregular will depend on the exact details of the base.
Its a 49 sided polygon.
An n-sided polygon or n-gon, just like it sounds, has n sides. For example, a 13-sided polygon has 13 sides. A 24-gon has 24 sides.
If the polygon is also a quadrilateral (4 sided polygon) then the answer is trapezoid. But there are many multi-sided polygons that could have a pair of opposite parallel sides - hexagon for example or consider the following pentagon: /\ | | -- That was difficult, but you get the idea. It looks like a house.
None.