| A | B |
|---|
| complementary angles | two angles whose measures add up to equal 90 degrees |
| supplementary angles | two angles whose measures add up to 180 degrees |
| corresponding angles | two angles that occupy the same positions in different locations |
| vertical angles | the angles that are opposite each other when two lines intersect |
| angle | two rays with a common endpoint |
| vertex | the common endpoint shared by two rays |
| adjacent angles | two angles that share a common vertex and a common side |
| congruent | same size, same shape |
| degrees | the unit of measure used for angles |
| exterior angle theorem | equals the sum of the two remote interior angles |
| linear pair | supplementary and adjacent |
| right angle | measures exactly 90 degrees |
| acute angle | measures less than 90 degrees |
| obtuse angles | measure between 90 and 180 degrees |
| protractor | an instrument used to measure angles |
| straight angles | measures exactly 180 degrees |
| Triangle Inequality Theorem | the sum of the lengths of any two sides of a triangle must be greater than the third side |
| Triangle Sum Theorem | the sum of the measures of the 3 interior angles of a triangle must be 180 degrees |
