z=−6−5iFind the angle θ (in degrees) that z makes in the complex plane.Round your answer, if necessary, to the nearest tenth. Express θ between −180∘ and 180∘.θ=□∘
Q. z=−6−5iFind the angle θ (in degrees) that z makes in the complex plane.Round your answer, if necessary, to the nearest tenth. Express θ between −180∘ and 180∘.θ=□∘
Identify Parts of z: Identify the real and imaginary parts of the complex number z.z=−6−5i has a real part of −6 and an imaginary part of −5.
Calculate Angle using Arctangent: Calculate the angle θ using the arctangent function.The angle θ in the complex plane is given by the arctangent of the imaginary part divided by the real part, which is arctan(realimaginary).θ=arctan(−6−5)
Use Calculator for Theta: Use a calculator to find the value of theta. θ=arctan(−5/−6)=arctan(65)Since we are using a calculator, we need to ensure it is set to degree mode.
Calculate Angle in Degrees: Calculate the angle in degrees.θ≈arctan(65)≈39.8∘However, since the complex number is in the third quadrant (both real and imaginary parts are negative), we need to add 180∘ to get the angle in the correct quadrant.θ=39.8∘+180∘
Final Value of Theta: Calculate the final value of theta.θ=39.8°+180°=219.8°Since we want the angle between −180° and 180°, we subtract 360° to get the angle in the desired range.θ=219.8°−360°
Find Angle in Range: Find the final angle θ in the specified range.θ=−140.2∘This is the angle that z makes in the complex plane, expressed between −180∘ and 180∘.
More problems from Find trigonometric ratios using a Pythagorean or reciprocal identity