# Geometry Test 3.1-3.3

## 22 terms

### Parallel Lines

coplanar lines that do not intersect

### Skew Lines

lines that do not intersect and are not coplanar

### Parallel Planes

planes that do not intersect

### Transversal

a line that intersects two or more coplanar lines at different points

### Interior Angles

angles on the inside of parallel lines cut by a transversal

### Exterior Angles

angles on the outside of parallel lines cut by a transversal

### Consecutive Interior Angles

angles that are on the same side of the transversal and inside the two lines

### Alternative Interior Angles

A pair of angles which are both interior, different sides of the transversal and nonadjacent

### Corresponding Angles

A pair of angles which are on the same side of the transversal, one must be interior, one must be extirior, and they must be nonadjacent

### Corresponding Angles Postulate

if two parallel lines are cut by a transversal, then the pairs of corresponding angles are congruent

### Alternate Interior Angles Theorem

if two parallel lines are cut by a transversal, then the pairs of alternate interior angles are congruent

### Consecutive Interior Angles Theorem

If two parallel lines are cut by a transversal, then the pairs of consecutive interior angles are supplementary

### Alternative Exterior Angles Theorem

If two parrallel lines are cut by a transversal, then the pairs of alternative exterior angles are congruent

### Perpendicular Transversal Theorem

in a plane, if a line is perpendicular to one of two parallel lines, then it is perpendicular to the other

### Slope

the steepness of a line on a graph, equal to its vertical change divided by its horizontal change

### Positive Slope

A situation where as the independent variable increases in value, the dependent variable will increase in value and vice versa.

### Negative Slope

A situation where as an independent variable increases in value, the dependent variable will decrease in value and vice versa.

### Zero Slope

line is horizontal ex: -5/0

### Undefined Slope

Slope of a vertical line ex: 0/-5

### Rate of Change

Slope can be interpreted as a rate of change, describing how a quantity Y changes in relationship to quantity X

### Slopes of Parallel Lines

In a coordinate plane, two nonvertical lines are parallel if and only if they have the same slope. Any two vertical lines are parallel.

### Slopes of Perpendicular Lines

Slopes that are opposite reciprocals.