Chapter 4.1, Problem 9E

To determine

The measurement of angle in degree for given:

  

Answer to Problem 9E

The angular measurement is $-170°$ .

Explanation of Solution

Given:

The angle is shown below:

  

Calculation:

Steps to measure given angle are:

Measure horizontal angle by protractor which is shown below:

  

Here, angle x is equal to the measured angle $10°$ (alternate opposite angle)

Now given angle as follows:

  $\begin{array}{l}\Rightarrow 180°-10°\\ \Rightarrow 170°\end{array}$

Direction of angle is clockwise. So, the angle can take as negative.

Thus, the angular measurement is $-170°$ .