Flashcards in 13-16 Post. Ch 3 Theorems And Definitions Deck (14):

1

## Alternate interior angles theorem

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

2

## Alternate exterior angles theorem

### If two parallel lines are cut by a transversal then the pairs of alternate exterior angles are congruent

3

## Consecutive interior angles theorem

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

( inside ones, same side, adding to 180)

4

## Parallel postulate

### If there is a line and a point not on the line then there is exactly one line through the point parallel to the given line

5

## Perpendicular postulate

### If there is a line and a point not on the line then there is exactly one line through the point perpendicular to the given line

6

## Corresponding angles

### Two angles are corresponding angles if they have corresponding positions

7

## Alternate interior angles

### Two angles are alternate interior angles if they lie between the two lines and opposite sides of the transversal

8

## Alternate exterior angles

### Two angles are alternate exterior angles if they lie outside the two lines and on opposite sides of the transversal

9

## Consecutive interior angles

### If they lie between two lines and on the same side of the transversal

10

## Corresponding angles converse postulate

### If two lines are cut by a transversal so the corresponding angles are congruent then the lines are parallel

11

## Alternate interior angles converse theorem

### If two lines are cut by a transversal so the alternate interior angles are congruent then the lines are parallel

12

## Alternate exterior angles converse theorem

### If two lines are cut by a transversal so the alternate exterior angles are congruent then the lines are parallel

13

## Consecutive interior angles converse theorem

### If two lines are cut by a transversal so the consecutive interior angles are supplementary them the lines are parallel

14