Answer:
AB
Explanation:
You want the longest side of triangle ABC with angles A=71°, B=35°, C=74°.
Law of sines
The law of sines tells you that side lengths are proportional to the sine of the opposite angle. This means the longest side is opposite the largest angle.
Longest side
The largest angle is C = 74°, so the longest side is opposite.
The longest side is AB.