## I

## Term |
## Definition |

I | Roman Numeral for 1 |

included angle | the angle between two given sides. Theta is the the included angle between side a and side c |

independent variable | variable plotted on the horizontal axis and is manipulated to see what effects it causes in the dependent variable, plotted on the vertical axis. x is usually the independent variable, y is the dependent. |

inequality | expression that states one quantity is greater than, greater than or equal to, less then or less than or equal to another quantity x > y x is greater than y x ≥ y x is greater than or equal to y x < y x is less than y x ≤ y x is less than or equal to y |

infinity | ∞, the symbol to represent a number with no end, the largest number you can have |

integer | a whole number |

interval | a section of a line |

initial | at the beginning, t = 0 |

irrational number | a number that cannot be expresses as a whole number, a fraction, a finite or recurring decimal. Some examples of irrational numbers: π, ℮, √2, √8 |

irregular polygon | any polygon with sides that are not all equal |

isosceles trapezium | trapezium with its non-parallel sides equal |

isosceles triangle | triangle with two equal sides and two equal base angles |