A ___ pyramid is a pyramid with ___ as its base. In this case, we have a nonagon, a nine-sided polygon, as the base. So, if you imagine each edge of the nonagon as having one triangular side coming off of it, and all of the triangular sides meeting at a point over the base, you then have 9 sides, one for each edge, plus the base itself - 10 sides total.
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A nonagon has 9 sides
Nine lateral sides,
A rectangular pyramid has five sides
A pyramid has 4 straIGHT SIDES
A Mayan pyramid has five sides, including the rectangular base.