|
 straight angle | an angle that measures exactly 180 degrees |
| supplementary angles | the sum of two angles that is exactly 180 degrees |
| vertex | the point where the sides meet on an angle |
| acute angle | an angle that measures less than 90 degrees |
| complementary angles | the sum of two angles that is exactly 90 degrees |
| congruent angles | two angles that have the same measure |
| obtuse angle | an angle that is greater than 90 degrees |
| leg | the sides that are adjacent to the right angle in a triangle |
| Pythagorean Theorem | if a triangle is a right triangle, then the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the legs. |
| hypotenuse | the side opposite the right angle in a triangle |
| congruent figures | two figures that have the same measure |