Chapter 11.5, Problem 27CCR

To determine

To determine $m\angle A$ value.

Answer to Problem 27CCR

  $m\angle A=163°$

Explanation of Solution

Given:

  $m\angle B=17°$

  $\angle A$ and $\angle B$ are supplementary angle

Calculation:

If, $\angle A$ and $\angle B$ are supplementary angle, then

  $\Rightarrow \angle A+\angle B=180°$

Putting the value of $m\angle B=17°$ ,

  $\Rightarrow \angle A+17°=180°$

  $\Rightarrow \angle A=180°-17°$

  $\Rightarrow \angle A=163°$

Conclusion:

Therefore, the value is $m\angle A=163°.$