Chapter 15.1, Problem 5PSA

To determine

To Justify: The relation between $\angle A\&\angle 2$ .

Answer to Problem 5PSA

  $\angle A-\angle 2=\angle 1$

Explanation of Solution

Given:

  $\angle A=\angle 1+\angle 2$

Formula Used:

  $a\left(c+d\right)=ac+ad$

Calculation:

  $\begin{array}{l}\angle A=\angle 1+\angle 2\\ \text{⇒}\angle A-\angle 2=\angle 1\end{array}$

Conclusion:

Thus, $\angle A-\angle 2=\angle 1$ .