| A | B |
|---|
| angle | two rays that share a common endpoint(vertex) |
| protractor | tool used to measure angles |
| acute angle | angle that measures less than 90 degrees |
| right angle | angle that measures 90 degrees |
| obtuse angle | angles that measures more than 90 but less than 180 degrees |
| straight angle | measures 180 degrees |
| adjacent angle | angles that share a vertex and a side |
| complementary angles | the sum of the measures of 2 angles is 90 degrees |
| supplementary angles | the sum of the measures of two angles is 180 degrees |
| scalene triangle | a triangle with no congruent sidess |
| isosceles triangle | a triangle with two congruent sides |
| equilateral triangle | a triangle with three congruent sides |
| right triangle | a triangle with one right angle |
| acute triangle | a triangle with 3 acute angles |
| obtuse triangle | a triangle with one obtuse angle |
| triangle | a polygon with 3 sides |
