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 |
