3-1+Lines+&+Angles

=Lines and Angles = text book page: 130

- identifying relationships between lines - angles being formed by transversals
 * what you will be doing in this section?**


 * **parallel postulate:** is a line & a point not on the line, then there is exactly one line through the point parallel to the given line.

__one line goes through the line D parallel to I__


 * **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.

 __there is one line through point K __ __The line is perpendicular o point P __


 * Identifying <'s formed by transversals**

__**terms:**__
 * transversal-** intersecting a system of lines.
 * corresponding angles**- the angles that occupy the same relative position at each intersectionwhere a straight line crosses two others. If the two lines are parallel, the corresponding angles are equal.
 * alternate exterior angles-**The pairs of angles on opposite sides of the transversal but outside the two lines are called Alternate Exterior Angles.
 * alternate interior angles-**The **p**airs of angles on opposite sides of the transversal but inside the two lines are called Alternate Interior Angles.