Q. u=(7,−4)Find the direction angle of u.Enter your answer as an angle in degrees between 0∘ and 360∘ rounded to the nearest hundredth.θ=□°
Calculate Tangent: To find the direction angle of the vectoru=(7,−4), we need to calculate the angle θ that the vector makes with the positive x-axis. The direction angle can be found using the arctangent function (tan−1), which gives us the angle whose tangent is the ratio of the y-coordinate to the x-coordinate of the vector.
Use Arctangent Function: Calculate the tangent of the angle θ using the y-coordinate and the x-coordinate of u: tan(θ)=7−4.
Perform Calculation: Use the arctangent function to find the angle θ: θ=tan−1(7−4). Make sure to use a calculator set to degree mode for this calculation.
Add 360 Degrees: Perform the calculation: θ=tan−1(−4/7)≈−29.74∘. This is the angle that u makes with the positive x-axis, measured counterclockwise. However, since the angle is negative, it is measured clockwise from the positive x-axis.
Round Direction Angle: To find the direction angle between 0∘ and 360∘, we add 360∘ to the negative angle: θ=−29.74∘+360∘≈330.26∘.
Round Direction Angle: To find the direction angle between 0∘ and 360∘, we add 360∘ to the negative angle: θ=−29.74∘+360∘≈330.26∘.Round the direction angle to the nearest hundredth: θ≈330.26∘.
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