To find the measure of the third angle we must use the next statement:
We have two angles so we can represent the situation with a equation
[tex]109.7+47.1+x=180[/tex]Where x is the third angle.
Now, we must solve the equation for x
[tex]\begin{gathered} x=180-109.7-47.1 \\ x=23.2 \end{gathered}[/tex]Finally, the measure of the third angle is 23.2
Letter A.