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z=-6-5i
Find the angle 
theta (in degrees) that 
z makes in the complex plane.
Round your answer, if necessary, to the nearest tenth. Express 
theta between 
-180^(@) and 
180^(@).

theta=◻" 。 "

z=65i z=-6-5 i \newlineFind the angle θ \theta (in degrees) that z z makes in the complex plane.\newlineRound your answer, if necessary, to the nearest tenth. Express θ \theta between 180 -180^{\circ} and 180 180^{\circ} .\newlineθ= \theta=\square^{\circ}

Full solution

Q. z=65i z=-6-5 i \newlineFind the angle θ \theta (in degrees) that z z makes in the complex plane.\newlineRound your answer, if necessary, to the nearest tenth. Express θ \theta between 180 -180^{\circ} and 180 180^{\circ} .\newlineθ= \theta=\square^{\circ}
  1. Identify Parts of zz: Identify the real and imaginary parts of the complex number zz.z=65iz = -6 - 5i has a real part of 6-6 and an imaginary part of 5-5.
  2. Calculate Angle using Arctangent: Calculate the angle θ\theta using the arctangent function.\newlineThe angle θ\theta in the complex plane is given by the arctangent of the imaginary part divided by the real part, which is arctan(imaginaryreal)\text{arctan}(\frac{\text{imaginary}}{\text{real}}).\newlineθ=arctan(56)\theta = \text{arctan}(\frac{-5}{-6})
  3. Use Calculator for Theta: Use a calculator to find the value of theta. \newlineθ=arctan(5/6)=arctan(56)\theta = \text{arctan}(-5/-6) = \text{arctan}(\frac{5}{6})\newlineSince we are using a calculator, we need to ensure it is set to degree mode.
  4. Calculate Angle in Degrees: Calculate the angle in degrees.\newlineθarctan(56)39.8\theta \approx \arctan(\frac{5}{6}) \approx 39.8^\circ\newlineHowever, since the complex number is in the third quadrant (both real and imaginary parts are negative), we need to add 180180^\circ to get the angle in the correct quadrant.\newlineθ=39.8+180\theta = 39.8^\circ + 180^\circ
  5. Final Value of Theta: Calculate the final value of theta.\newlineθ=39.8°+180°=219.8°\theta = 39.8° + 180° = 219.8°\newlineSince we want the angle between 180°-180° and 180°180°, we subtract 360°360° to get the angle in the desired range.\newlineθ=219.8°360°\theta = 219.8° - 360°
  6. Find Angle in Range: Find the final angle θ\theta in the specified range.θ=140.2\theta = -140.2^\circThis is the angle that zz makes in the complex plane, expressed between 180-180^\circ and 180180^\circ.

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