| Term | Definition |
|---|
| elapsed time | The difference between a starting time and an ending time. |
| triangle | A polygon with three sides and three angles. |
| acute triangle | A triangle whose largest angle measures less than 90 degrees. |
| equilateral triangle | A triangle in which all sides are the same length. |
| isosceles triangle | A triangle with at least two sides of equal length. |
| right triangle | A triangle whose largest angle measures 90 degrees. |
| obtuse triangle | A triangle whose largest angle measures more than 90 degrees and less than 180 degrees. |
| scalene triangle | A triangle with three sides of different lengths. |
| classify | Arrange by class or kind. |
| mixed number | A whole number and a fraction together. |
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