Angles

[Hockeyman]

True or False?

If line AB intersects line CD at point P, then angle APC and BPD form a linear pair of angles.

I know it is false, but why? I know that when I drew it out the two angles are verticle angles. So i guess I am wondering what are linear angles?

 

[Gene]

A linear pair of angles is formed when two lines intersect. Two angles are said to be linear if they are adjacent angles formed by two intersecting lines. The measure of a straight angle is 180 degrees, so a linear pair of angles must add up to 180 degrees.