4. Remember!
Two or more angles in standard position are
coterminal angles if the position of P is the same for
each angle.
If θ represents any angle, then any angle coterminal
with θ is represented by this expression, where n is
an integer, θ + n(360).
5. Example 1: θ = 150
A. Draw the angle θ in
standard position.
B. Find an angle which is
coterminal with θ.
C. Write an expression to
represent any angle
coterminal with θ.
6. What is reference angle?
For any angle θ in
standard position, its
reference angle (or related
angle) is the acute angle
formed by the terminal side
of θ and the x-axis.
