D. 16.8 units
A radius is half of the diameter, so to get the answer all you need to do is multiply the length of the given radius by 2.
8.4x2= 16.8
18 line segments also for faster and better u can 6 times 3 since there is already three in a triangle.
D is the answer that is graphed.
Answer: 2 and 4
Step-by-step explanation: the quick way is by dividing all the answer options
