Calculate triangular number 45

Triangular numbers form a triangle shape

T_{n} = | n(n + 1) |

2 |

T_{45} = | 45(45 + 1) |

2 |

T_{45} = | 45(46) |

2 |

T_{45} = | 2070 |

2 |

T_{45} = **1,035**

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- 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.
- triangle
- a flat geometric figure that has three sides and three angles
- triangular number

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