Angle Relationships Mr. Barrios 4/21/08 Mr. Barrios 4/21/08

Point  A point is a spot on a line that is labeled by a letter.  Example of a point is the top of this Golden Gate Bridge.  A point is a spot on a line that is labeled by a letter.  Example of a point is the top of this Golden Gate Bridge.

Line  A line is straight and moves in two directions infinitely.  If the Golden Gate Bridge went on forever, it would be a line.  A line is straight and moves in two directions infinitely.  If the Golden Gate Bridge went on forever, it would be a line.

Line Segment

Ray  A ray begins at a point and moves in a straight line forever.  Shining a flashlight is like a ray.  A ray begins at a point and moves in a straight line forever.  Shining a flashlight is like a ray.

Intersection  When two lines cross one and other, the point that is made is the intersecting point.  Two streets that cross each other make an intersecting point.  When two lines cross one and other, the point that is made is the intersecting point.  Two streets that cross each other make an intersecting point.

Transversal  A line that cuts through another line, making four angles in doing so.

Vertical Angles  Vertical angles are made when two lines intersect each other.  Because angles 1 & 3 are vertical (their noses touch), they are congruent.  Vertical angles are made when two lines intersect each other.  Because angles 1 & 3 are vertical (their noses touch), they are congruent.

Corresponding Angles  Corresponding angles are also congruent.  Always on the same side of the transversal.  Every other angle is a corresponding angle.  Corresponding angles are also congruent.  Always on the same side of the transversal.  Every other angle is a corresponding angle.

Alternate Interior Angles  Alternate interior angles are also congruent.  The angles are always in between the two parallel lines.  They are vertical to one and other.  Which are alternate interior angles?  Alternate interior angles are also congruent.  The angles are always in between the two parallel lines.  They are vertical to one and other.  Which are alternate interior angles?

Alternate Exterior Angles  Very similar to alternate interior angles, except on the outside of the parallel lines.  Congruent angles.  Very similar to alternate interior angles, except on the outside of the parallel lines.  Congruent angles.