Chapter 4.1, Problem 21E

To determine

The measurement of angle in degree for given:

  

Answer to Problem 21E

The angular measurement is $210°$ .

Explanation of Solution

Given:

The angle is shown below:

  

Calculation:

Steps to measure given angle are:

First, use protractor to measure complete angle which is 180 degree as shown below:

  

Then, measure angle by the second line segment with the help of protractor as shown below:

  

This gives the angle as 30 degree.

Total angle is,

  $\begin{array}{l}\Rightarrow 180°+30°\\ \Rightarrow 210°\end{array}$

Thus, the angular measurement is $210°$ .