| A | B |
|---|
| acute angle | an angle whose measure is between 0 and 90 degrees |
| obtuse angle | an angle whose measure is between 90 and 180 degrees |
| straight angle | an angle whose measure is exactly 180 degrees |
| right angle | an angle whose measure is exactly 90 degrees |
| isosceles triangle | a triangle with two congruent sides |
| equilateral triangle | a triangle with all sides being congruent |
| scalene triangle | a triangle with no congruent sides |
| bisect | to cut into two equal parts |
| parallel lines | two lines which never intersect |
| point | a dot in space |
| line segment | a piece of a line that has two endpoints |
| adjacent angles | two angles which share a side |
| vertical angles | two angles which share a common vertex and are opposite of each other |
| supplementary angles | two angles whose sum is 180 degrees |
| complimentary angles | two angles whose sum is 90 degrees |
| The sum of the interior angles of a triangle | are 180 degrees |
