Standard Position, Coterminal and Reference Angles
standard position
- an angle is in standard postion if its vertex is located at the origin and one ray is on the positive x-axis.
coterminal angles
two angles that have the same terminal side.
Quadrantal angle
- if the terminal side of an angle lies on the axis (like a 90 or 180 degree angle).
initial side
- the ray on the x-axis of an angle in standard position.
terminal side
- the ray that rotates in an angle in standard position.
260 degrees
Find an angle coterminal to -100 degrees
-250 degrees
Find an angle coterminal to 110 degrees
-200 degrees
Find an angle coterminal to 160 degrees
440 degrees
Find an angle coterminal to 80 degrees
80 degrees
Find the reference angle of 100 degrees
30 degrees
Find the reference angle of 210 degrees
60 degrees
Find the reference angle of 300 degrees
reference angle
an acute angle formed by the terminal side of the given angle and the x-axis.
clockwise angle measurement
the measurement of the angle is negative
Counterclockwise angle measurement
the measurement of the angle is positive