Please help! I don't understand how to do this.

Step-by-step explanation:
8). CA = 9.20 ( multiply the given decimal by 100)
AB = 10.80
CB = 8.50
9). option e is correct side - side - side
10). SSS
11). 1 ( because with the given info. u can calculate the perimeter of the traingle only )
12) through the given info we can only find the perimeter of the traingle
so,
perimeter = sum of all sides
→ 9.2 + 8.5 + 10.8 = 28.5 m
hope this answer helps you dear...take care may u have a great day ahead!