Calculate pentagonal number 9
Pentagonal Number Formula
| Pn = | n(3n - 1) |
| 2 |
Given n = 9, we have:
| P9 = | 9(3(9) - 1) |
| 2 |
| P9 = | 9(27 - 1) |
| 2 |
| P9 = | 9(26) |
| 2 |
| P9 = | 234 |
| 2 |
P9 = 117
What is the Answer?
P9 = 117
How does the Pentagonal Number Calculator work?
Free Pentagonal Number Calculator - This calculator determines the nth pentagonal number
This calculator has 1 input.
This calculator has 1 input.
What 1 formula is used for the Pentagonal Number Calculator?
Pn = n(3n - 1)/2
What 5 concepts are covered in the Pentagonal Number Calculator?
- figurate number
- a number that can be represented by a regular geometrical arrangement of equally spaced points. If the arrangement forms a regular polygon, the number is called a polygonal.
- formula
- a fact or a rule written with mathematical symbols. A concise way of expressing information symbolically.
- number
- an arithmetical value, expressed by a word, symbol, or figure, representing a particular quantity and used in counting and making calculations and for showing order in a series or for identification. A quantity or amount.
- pentagon
- a polygon of five angles and five sides
- pentagonal number
- A number that can be shown as a pentagonal pattern of dots.
n(3n - 1)/2
