Lesson 2 Notes

Vertical angles are the opposite angles formed by two intersecting lines.  Vertical angles have equal measures.

Adjacent angles are two angles that are in the same plane and share a vertex and a side but no interior points.

Supplementary angles are two angles whose measures sum to 180 degrees.  They may or may not be adjacent.

Complementary angles are two angles whose measures sum to 90 degrees.  They may or may not be adjacent.

For other definitions, click here.