With a SSS you’ll only see the little tick marks but on a SAS you’ll see a tick, angle indication, then another tick
12.8-12.4=0.4
0.4 divide by 12.4 = 0.0322
0.0322 x 100 = 3.22%
The answer is 357 hope it helped
The following are the general steps to draw a hexagon inscribed in a circle:
First draw a circle with center A through B:
Then the intersection points will be vertex C and vertex D of the hexagon. Doing this for each vertex (from left to right) we will get the following: