# Geometry Chapter 3 Vocab

## 17 terms

### Parallel Lines

Coplanar lines that do not intersect

### Perpendicular Lines

Lines that intersect at 90 degree angles

### Skew Lines

Noncoplanar lines

### Transversal Line

Line that intersects two coplanar lines at different Points

### Corresponding Angles

Angles that lie on the same side of the transversal and on the same side of the coplanar lines

### Alternate Interior Angle

Nonadjacent angles that lie on opposite sides of the transversal between the coplanar lines

### Alternate Exterior Angles

Lie on opposite lines of the transversal outside the coplanar lines

### Same Sided Interior Angles

Lie on the same side of the transversal between the two coplanar lines

### Corresponding Angles Postulate

If two parallel lines are cut by a transversal, then corresponding angles are congruent

### Alternate Interior Angles Theorem

If two parallel lines are cut by a transversal, the alternate interior angles are congruent

### Alternate Exterior Angles Theorem

If two parallel lines are cut by a transversal, then alternate exterior angles are congruent

### Same-sided Interior Angles Theorem

If two parallel lines are cut by a transversal then same sided interior angles are supplementary

### Converse of Corresponding Angles Postulate

If two coplanar lines are cut by a transversal such that corresponding angles are congruent, then the lines are parallel

### Parallel Postulate

Through a point P not on a line L there is exactly one line parallel to line L

### Converse of the Alternate Interior Angle Theorem

If two coplanar lines are cut by a transversal, such that alternate interior angles are congruent, then the lines are parallel

### Converse of the Alternate Exterior Angles Theorem

If two coplanar lines are cut by a transversal such that alternate exterior angles are congruent, then the lines are parallel

### Converse of the Same-sided Interior Angles Theorem

If two lines are cut by a transversal such that same side interior angles are supplementary, then the lines are parallel