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1.
acute triangle: A triangle whose largest angle measures less than 90 degrees

2.
certain: An event will definitely occur; a probability of 1

3.
chance: How likely it is for an event to happen written as a percentage

4.
congruent: Same size and shape

5.
equilateral triangle: A triangle in which all sides are the same length

6.
experiment: A test to find or illustrate a rule

7.
impossible: An event will definitely not occur; a probability of 0

8.
isosceles triangle: A triangle with at least two sides of equal length

9.
leap year: A year with 366 days

10.
millenium: A thousand years

11.
obtuse triangle: A triangle whose largest angle measures more than 90 degrees

12.
outcome: Any possible result of an experiment

13.
parallel lines: Lines that stay the same distance apart -- they NEVER cross

14.
percent: Out of 100

15.
perpendicular lines: Two lines that intersect at right angles

16.
probability: How likely it is for an event to happen written as a fraction/ratio

17.
right triangle: A triangle whose largest angle measures 90 degrees

18.
scalene triangle: A triangle with three sides of different lengths

19.
sector: A region bordered by part of a circle and two radii

20.
similar: Having the same shape, but not the same size

21.
vertex: Point of an angle, polygon, or solid where two or more lines or line segments meet

## Vocab #11Study online at quizlet.com/_8sp7 |

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