Outrageously Funny Word Dictionary :: Pennatulaceous

👉 Pentagonal is a type of mathematical object that represents a triangular prism. It is named after the pentagonal number sequence, which starts with 1, 3, 6, 9, and so on, and continues in an increasing pattern. A pentagonal number is a figurate number that extends the concept of triangular numbers to include non-convex polygons. Pentagonal numbers are defined as follows: - The first few pentagonal numbers (starting with 1): -

pennatulaceous