Module · Geometry
Chapter 19: Lines & Angles
Geometry
3 topics
What this chapter covers
The 3 topics below make up Lines & Angles on the GRE. Click any topic to open its notes, examples and practice test.
Study material & tests
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Formula Reference Sheet
This chapter
Angle pairs
| Complementary angles | a + b = 90° |
|---|---|
| Supplementary angles (linear pair) | a + b = 180° |
| Vertical (opposite) angles | a = b (always equal) |
| Angles on a straight line | sum = 180° |
| Angles around a point | sum = 360° |
Parallel lines cut by a transversal
| Corresponding angles | equal |
|---|---|
| Alternate interior angles | equal |
| Alternate exterior angles | equal |
| Co-interior (same-side interior) | supplementary (sum 180°) |
GRE reference
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