Test on Parallel Lines

Summary and Review

Two More Ways to Prove Triangles Congruent

The Angles of a Triangle

More on Distance

Algebra Review

Some Consequences of the Parallel Postulate

The Parallel Postulate

If a straight line crossing two straight lines makes the alternate angles equal to one another, the straight lines will be parallel to one another. Euclid's Fifth Postulate

Here is the construction

Given a line and a point, construct a line through the point, parallel to the given line.

Theorem:

In a plane, two lines parallel to a third line are parallel to each other. 

:DO

Set 1, #1-17

Perpendicular Lines

Theorems:

In a plane, through a point on a line there is exactly one line perpendicular to the line

Through a point not on a line, there is exactly one line perpendicular to the line.

The book shows some constructions -- look at these similar ones online:

• Given point P on line k, construct a line through P, perpendicular to k.
• Given point R, not on line k, construct a line through R, perpendicular to k.

Try
ThatQuiz

 Do;

Set 1, #1-3, 12-18

Proving Lines Parallel

Definition of a Parallel:

Two lines are parallel iff they lie in the same plane and do not intersect

Look AT:   a page that explains some of the parallel theorems and corollaries

Try a Thatquiz on Angles

DO:

Set 1, #1-23