Answer:
C. 54°
Step-by-step explanation:
We know: measures of angles in a triangle add up to 180°.
Therefore we have the equation:
[tex]\gamma+\gamma+72^o=180^o[/tex] subtract 72° from both sides
[tex]2\gamma=108^o[/tex] divide both sides by 2
[tex]\gamma=54^o[/tex]
