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# Math Vocab-Unit 9

### Points, Lines, and Angles

TermDefinition
acute An angle  that measures less than 90°
acute triangle A triangle in which each of the three angles is acute​
adjacent angles​ Two angles that share a common vertex and exactly one ray​
angle​ Two rays with a common vertex​
congruent​ Same size, same shape​
line of symmetry​ Line that divides a figure into two congruent parts that are mirror images of each other​
obtuse​ An angle that measures greater than 90° but less than 180°​
obtuse triangle​ A triangle that has one obtuse angle and two acute angles​
point​ A specific location in space​
polygon​ A closed figure with three or more sides, where all sides are straight
ray​ Part of a line that begins at one endpoint and continues without end in one direction​
right​ An angle formed by perpendicular lines that measures exactly 90°​
right triangle​ A triangle with one right angle and two acute angles​
straight​ An angle that measures 180°​
Created by: Remedies