Lines and angles

1. Angles

1.1. Supplementry

1.1.1. Complementary

1.1.1.1. Two angles are called complementary if their measures add to 90 degrees,

1.1.2. Angles are supplementary if their measures add to 180 degrees.

1.2. Adjacent

1.2.1. In geometry, two angles are adjacent, if they have a common side and a common vertex. In other words, adjacent angles are directly next to each other and do not overlap

2. Lines

2.1. Traversal and parallel lines

2.1.1. When two or more lines are cut by a transversal, the angles which occupy the same relative position are called corresponding angles . When the lines are parallel, the corresponding angles are congruent . ... If two parallel lines are cut by a transversal, then the alternate interior angles formed are congruent .