Correct Answer - Option 4 : Angle

According to the given information,

**Square, Pentagon, and Hexagon are the 2 - D shapes.**

**While Angle is a measurement unit.**

So, Angle does not belong with the other words.

Hence, the correct answer is **"Angle"**.

**Shape** |
**Sides** |

Triangle |
3 |

Square |
4 |

Pentagon |
5 |

Hexagon |
6 |

Heptagon |
7 |

Octagon |
8 |

Nonagon |
9 |

Decagon |
10 |