# Everything about 9

Discover a lot of information on the number 9: properties, mathematical operations, how to write it, symbolism, numerology, representations and many other interesting things!

## Mathematical operations

Operations and solutions |

9*2 |
= |
18 |
The double of 9 is 18 |

9*3 |
= |
27 |
The triple of 9 is 27 |

9/2 |
= |
4.5 |
The half of 9 is 4.500000 |

9/3 |
= |
3 |
The third of 9 is 3.000000 |

9^{2} |
= |
81 |
The square of 9 is 81.000000 |

9^{3} |
= |
729 |
The cube of 9 is 729.000000 |

√9 |
= |
3 |
The square root of 9 is 3.000000 |

log(9) |
= |
2.1972245773362 |
The natural (Neperian) logarithm of 9 is 2.197225 |

log10(9) |
= |
0.95424250943932 |
The decimal logarithm (base 10) of 9 is 0.954243 |

sin(9) |
= |
0.41211848524176 |
The sine of 9 is 0.412118 |

cos(9) |
= |
-0.91113026188468 |
The cosine of 9 is -0.911130 |

tan(9) |
= |
-0.45231565944181 |
The tangent of 9 is -0.452316 |