Math Definitions - Letter P

Pentagonal Number

Definition of Pentagonal Number

Definition of Pentagonal Number

A pentagonal number is a number that can be drawn using a pattern of dots in the shape of a pentagon, like the ones in the diagram.

The first six pentagonal numbers are \(1,5,12,22,35\) and \(51\).


The aim of this dictionary is to provide definitions to common mathematical terms. Students learn a new math skill every week at school, sometimes just before they start a new skill, if they want to look at what a specific term means, this is where this dictionary will become handy and a go-to guide for a student.


Year 1 to Year 12 students

Learning Objectives

Learn common math terms starting with letter P

Author: Subject Coach
Added on: 6th Feb 2018

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