Given the following point on the unit circle, find the angle, to the nearest tenth of a degree (if necessary), of the terminal side through that point, 0^{\circ} \leq \theta<360^{\circ} .P=(33,−36)Answer:
Q. Given the following point on the unit circle, find the angle, to the nearest tenth of a degree (if necessary), of the terminal side through that point, 0∘≤θ<360∘.P=(33,−36)Answer:
Identify Point P: Identify the coordinates of point P on the unit circle.Point P has coordinates P=((33),(−36)).
Recognize Coordinates Correspondence: Recognize that the coordinates of point P correspond to the cosine and sine of the angle θ, respectively.cos(θ)=(33) and sin(θ)=−(36).
Calculate Reference Angle: Calculate the reference angle θ′ using the arccosine of the absolute value of the x-coordinate.Θ′=arccos(∣3/3∣).
Perform Reference Angle Calculation: Perform the calculation for the reference angle. Θ′=arccos(33). Using a calculator, we find that Θ′≈54.7 degrees.
Determine Point Quadrant: Determine the quadrant in which point P lies.Since the x-coordinate is positive and the y-coordinate is negative, point P lies in the fourth quadrant.
Find Actual Angle: Find the actual angle θ by subtracting the reference angle from 360 degrees, as the point is in the fourth quadrant.Θ=360−Θ′.
Perform Angle Calculation: Perform the calculation to find the angle θ.θ=360−54.7.θ≈305.3 degrees.
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