4-1

 Thinking about angles differently:  Rotating a ray to create an angle  Initial side - where we start  Terminal side - where we stop

 Standard Position- the initial side is on the positive side of the x axis with the vertex on the origin  Positive angle – rotate counterclockwise  Negative angle – rotate clockwise

 Coterminal angles - angles are coterminal when there terminal ray is in the same position.  Radian measure – Radians are a ratio of arc length to radius. One radian is when the arc length is equal to the radius.

 Pg 255 #5-16 all