Answer: (-1π) / 3 is in quadrant 4 with reference angle π/3
        9π/4 is in quadrant 4 with reference angle π/4
        -7π/6 is in quadrant 3 with reference angle π/6
        7 (radians) is in quadrant 1 with reference angle 2[tex]\pi[/tex] - 7
Step-by-step explanation:
Given data,
        θ = -1[tex]\pi[/tex]/3
        θ = 9[tex]\pi[/tex]/4
        θ = -7[tex]\pi[/tex]/6
        θ = 7
The reference angle for an angle drawn in standard position (initial side is the positive x-axis with vertex at (0,0)) is the acute angle formed by the terminal side of the angle and the x-axis. Â
These formulas are in radians.
           θ = (-1pi) / 3
           θ = -180/3
          θ = -60
So, this is 4th quadrant
          θ = -45º
So, this is 4th quadrant
          θ = -210º 3rd
So, this is 3rd quadrant
7 (radians) is in quadrant 1 with reference angle 2[tex]\pi[/tex] - 7
(-1π) / 3 is in quadrant 4 with reference angle π/39π/4 is in quadrant 4 with reference angle π/4-7π/6 is in quadrant 3 with reference angle π/67 (radians) is in quadrant 1 with reference angle 2[tex]\pi[/tex] - 7
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