Final answer:
The length of AC is 6.81.
Step-by-step explanation:
To find the length of AC, we need to refer to the information provided in the question. The answer choices indicate different lengths for AC, so we need to match them with the given options. Looking at the options and comparing them with the given lengths, we find that the length of AC is 6.81 (option d).
The length of a line segment can be calculated using various methods, such as using the Pythagorean theorem for right-angled triangles, summing lengths if AC is composed of consecutive line segments, or applying trigonometry if angles and sides are known.