Answer:
27.66°
Step-by-step explanation:
From the law of cosines, ...
a² = b² +c² -2bc·cos(A)
cos(A) = (b² +c² -a²)/(2bc)
A = arccos((b² +c² -a²)/(2bc))
A = arccos((6.9² +4.7² -3.5²)/(2·6.9·4.7)) = arccos(57.45/64.86)
A ≈ 27.66°
The measure of angle A is about 27.66°.
