trigonometry

• ANGLE is the union pf two rays that share a common endpoint.
•  The RAYS are called the SIDES OF THE ANGLE.
• An angle is in standard position if its vertex is located at the origin and one ray is on the positive x-axis.

   
• The ray on the x-axis is called the TERMINAL SIDE.

   
• The INITIAL SIDE is where the angle starts and the TERMINAL SIDE is where the measurement of the angle stops.
• The angle is measured by the amount of rotation from the initial side to the terminal side.
• If measured in a COUNTER CLOCKWISE direction the measurement is POSITIVE
• If measured in a COUNTER CLOCKWISE direction the measurement is POSITIVE
• If measured in a CLOCKWISE direction the measurement is NEGATIVE.
• If measured in a CLOCKWISE direction the measurement is NEGATIVE.
• CO-TERMINAL ANGLES are angles in standard position that have a common terminal side
• To find a positive and negative co-terminal angle with a given angle, you can add and subtract 360°
• 60 min – 1hr

  3600s – 1hr

  1min – 60s
• REFERENCE ANGLES

  --- is a positive acute angle made by the terminal side of the angle and the x-axis