Post #3

Angles

Angles are formed by two rays with the same endpoint
Sides of an angle are formed by the two rays to form an angle
Vertex is the common endpoint of the two rays that form an angle
(it is complimentary to name an angle by its vertex)
Example: <B or <ABC

Types of Angles:
Acute- less than 90 degrees
Right- exactly 90 degree angle
Obtuse- greater than 90 degrees but less than 180 degrees  
Straight- exactly 180 degrees

 Angle Measurement

How to add and subtract angles that have degrees minutes and seconds

    1835' 29"
 + 2255' 41"
    4090' 70"
           +1  -60
   40 91'  10"
   +1   -60         
   4131'  10"

 14       89
  15 29'
-  3 45'
  11 44'