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=(53,54)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=(53,54)Answer:
Identify Coordinates: Identify the coordinates of point P on the unit circle.The given point P has coordinates (x,y)=(53,54). On the unit circle, these coordinates correspond to (cos(θ),sin(θ)).
Determine Reference Angle: Determine the reference angle.Since both x and y coordinates are positive, point P lies in the first quadrant. The reference angle is the angle θ′ that the terminal side makes with the x-axis. To find θ′, we use the arccosine or arcsine function. However, since we are in the first quadrant, θ′ is simply θ.
Calculate Using Arccosine: Calculate the angle using the arccosine function.We use the x-coordinate (cos(θ)) to find the angle θ. Thus, θ=arccos(53). We calculate this using a calculator.
Convert to Degrees: Convert the angle from radians to degrees.After calculating the arccosine, we get θ in radians. To convert it to degrees, we multiply by π180. However, since we are using a calculator, it can directly give us the angle in degrees.
Round to Nearest Tenth: Round the angle to the nearest tenth of a degree.Using a calculator, we find that θ≈arccos(53)≈53.13 degrees. Rounding to the nearest tenth of a degree, we get θ≈53.1 degrees.
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