Test friday! Check the book for the pictures.

### congruent supplements theorem

if two angles are supplementary to the same angle (or to congruent angles), then they are congruent.

### congruent complements theorem

if two angles are complementary to the same angle (or to congruent angles), then they are congruent. for example: if two angles are complementary to the same angle (or to congruent angles), then they are congruent.

### 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.

### 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.

### Alternate Interior Angles

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

### 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.

### Alternate Exterior Angles Theorem

If two parallel lines are cut by a transversal, then the pairs of alternate exterior 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.

### Corresponding Angles Converse

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

### Alternate Interior Angles Converse

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

### Alternate Exterior Angles Converse

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

### Consecutive Interior Angles Converse

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